/usr/share/fityk/html/script.html is in fityk 1.3.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Scripts — Fityk 1.3.1 manual</title>
<link rel="stylesheet" href="_static/fitheme.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: './',
VERSION: '1.3.1',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: false,
SOURCELINK_SUFFIX: '.txt'
};
</script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<link rel="shortcut icon" href="_static/fityk.ico"/>
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="All the Rest" href="ref.html" />
<link rel="prev" title="Curve Fitting" href="fit.html" />
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<div class="section" id="scripts">
<h1>Scripts<a class="headerlink" href="#scripts" title="Permalink to this headline">¶</a></h1>
<div class="section" id="working-with-scripts">
<h2>Working with Scripts<a class="headerlink" href="#working-with-scripts" title="Permalink to this headline">¶</a></h2>
<p>Scripts can be executed using the command:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span>exec filename
</pre></div>
</div>
<p>The file can be either a fityk script (usually with extension <code class="docutils literal"><span class="pre">fit</span></code>),
or a Lua script (extension <code class="docutils literal"><span class="pre">lua</span></code>).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Fityk can save its state to a script (<code class="docutils literal"><span class="pre">info</span> <span class="pre">state</span> <span class="pre">></span> <span class="pre">file.fit</span></code>).
It can also save all commands executed (directly or via GUI) in the session
to a script (<code class="docutils literal"><span class="pre">info</span> <span class="pre">history</span> <span class="pre">></span> <span class="pre">file.fit</span></code>).</p>
</div>
<p>Since a Fityk script with all the data inside can be a large file,
the files may be stored compressed and it is possible to directly read
gzip-compressed fityk script (<code class="docutils literal"><span class="pre">.fit.gz</span></code>).</p>
<p>Embedded Lua interpreter can execute any program in Lua 5.1.
One-liners can be run with command <code class="docutils literal"><span class="pre">lua</span></code>:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>lua print(_VERSION)
Lua 5.1
<span class="gp">=-> </span>lua print(os.date("Today is %A."))
Today is Thursday.
<span class="gp">=-> </span>lua for n,f in F:all_functions() do print(n, f, f:get_template_name()) end
0 %_1 Constant
1 %_2 Cycle
</pre></div>
</div>
<p>(The Lua <code class="docutils literal"><span class="pre">print</span></code> function in fityk is redefined to show the output
in the GUI instead of writing to <code class="docutils literal"><span class="pre">stdout</span></code>).</p>
<p>Like in the Lua interpreter, <code class="docutils literal"><span class="pre">=</span></code> at the beginning of line can be used
to save some typing:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>= os.date("Today is %A.")
Today is Thursday.
</pre></div>
</div>
<p>Similarly, <code class="docutils literal"><span class="pre">exec=</span></code> also interprets the rest of line
as Lua expressions, but this time the resulting string is executed
as a fityk command:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>= string.format("fit @%d", math.random(0,5))
fit 17
<span class="gp">=-> </span>exec= string.format("fit @%d", math.random(0,5))
<span class="c"># fitting random dataset (useless example)</span>
</pre></div>
</div>
<p>The Lua interpreter in Fityk has defined global object <code class="docutils literal"><span class="pre">F</span></code> which
enables interaction with the program:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>= F:get_info("version")
Fityk 1.2.1
</pre></div>
</div>
<p>Now the first example that can be useful. For each dataset write output
of the <code class="docutils literal"><span class="pre">info</span> <span class="pre">peaks</span></code> command to a file named after the data file,
with appended “.out”:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>@*: lua F:execute("info peaks ><span class="s1">'%s.out'</span>" % F:get_info("filename"))
</pre></div>
</div>
<p>This and other methods of <code class="docutils literal"><span class="pre">F</span></code> are documented in the next section.</p>
<p>Here is an example of Lua-Fityk interactions:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="c1">-- load data from files file01.dat, file02.dat, ... file13.dat</span>
<span class="kr">for</span> <span class="n">i</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span><span class="mi">13</span> <span class="kr">do</span>
<span class="n">F</span><span class="p">:</span><span class="n">execute</span><span class="p">(</span><span class="s2">"@+ < file%02d.dat:0:1::"</span> <span class="o">%</span> <span class="n">i</span><span class="p">)</span>
<span class="kr">end</span>
<span class="c1">-- print some statistics about the loaded data</span>
<span class="n">n</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">get_dataset_count</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="n">n</span> <span class="o">..</span> <span class="s2">" datasets loaded."</span><span class="p">)</span>
<span class="n">total_max_y</span> <span class="o">=</span> <span class="mi">0</span>
<span class="kr">for</span> <span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">n</span><span class="o">-</span><span class="mi">1</span> <span class="kr">do</span>
<span class="n">max_y</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">calculate_expr</span><span class="p">(</span><span class="s2">"max(y)"</span><span class="p">,</span> <span class="n">i</span><span class="p">)</span>
<span class="kr">if</span> <span class="n">max_y</span> <span class="o">></span> <span class="n">total_max_y</span> <span class="kr">then</span>
<span class="n">total_max_y</span> <span class="o">=</span> <span class="n">max_y</span>
<span class="kr">end</span>
<span class="kr">end</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"The largest y: "</span> <span class="o">..</span> <span class="n">total_max_y</span><span class="p">)</span>
</pre></div>
</div>
<p>If a fityk command executed from Lua script fails, the whole script is
stopped, unless you catch the error:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="c1">-- wrap F:execute() in pcall to handle possible errors</span>
<span class="n">status</span><span class="p">,</span> <span class="n">err</span> <span class="o">=</span> <span class="nb">pcall</span><span class="p">(</span><span class="kr">function</span><span class="p">()</span> <span class="n">F</span><span class="p">:</span><span class="n">execute</span><span class="p">(</span><span class="s2">"fit"</span><span class="p">)</span> <span class="kr">end</span><span class="p">)</span>
<span class="kr">if</span> <span class="n">status</span> <span class="o">==</span> <span class="kc">false</span> <span class="kr">then</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"Error: "</span> <span class="o">..</span> <span class="n">err</span><span class="p">)</span>
<span class="kr">end</span>
</pre></div>
</div>
<p>The Lua interpreter was added in ver. 1.0.3. If you have any questions
about it, feel free to ask.</p>
<p>Older, but still supported way to automate Fityk is to prepare
a stand-alone program that writes a valid fityk script to the standard output.
To run such program and execute the output use command:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span>exec ! program [args...]
</pre></div>
</div>
</div>
<div class="section" id="fityk-dsl">
<h2>Fityk DSL<a class="headerlink" href="#fityk-dsl" title="Permalink to this headline">¶</a></h2>
<p>As was described in <a class="reference internal" href="getstarted.html#cli"><span class="std std-ref">Command Line</span></a>, each line has a syntax:</p>
<blockquote>
<div>[[@…:] [with …] command [“;” command]…] [#comment]</div></blockquote>
<p>The datasets listed before the colon (<code class="docutils literal"><span class="pre">:</span></code>) make a <em>foreach</em> loop.
Here is a silly example:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>$a=0
<span class="gp">=-> </span>@0 @0 @0: $a={$a+1}; print $a
1
2
3
</pre></div>
</div>
<p>Command that follows the colon is run for each specified dataset
in the context of that dataset. This is to say that:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>@2 @4: guess Voigt
</pre></div>
</div>
<p>is equivalent to:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>use @2
<span class="gp">=-> </span>guess Voigt
<span class="gp">=-> </span>use @4
<span class="gp">=-> </span>guess Voigt
</pre></div>
</div>
<p>(except that the letter sets permenently default dataset to <code class="docutils literal"><span class="pre">@4</span></code>.</p>
<p><code class="docutils literal"><span class="pre">@*</span></code> stands for all datasets, from <code class="docutils literal"><span class="pre">@0</span></code> to the last one.</p>
<p>Usually, when working with multiple datasets, one executes a command
either for a single dataset or for all of them:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>@3: guess Voigt <span class="c"># just for @3</span>
<span class="gp">=-> </span>@*: guess Voigt <span class="c"># for all datasets</span>
</pre></div>
</div>
<p>The whole line is parsed and partly validated before the execution.
This may lead to unexpected errors when the line has
multiple semicolon-separated commands:</p>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>$a=4; print $a <span class="c"># print gives unexpected error</span>
Error: undefined variable: $a
<span class="gp">=-> </span>$b=2
<span class="gp">=-> </span>$b=4; print $b <span class="c"># $b is already defined at the check time</span>
4
</pre></div>
</div>
<p>Therefore, it is recommended to have one command in one line.</p>
<div class="section" id="grammar">
<h3>Grammar<a class="headerlink" href="#grammar" title="Permalink to this headline">¶</a></h3>
<p>The grammar is expressed in EBNF-like notation:</p>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">(*this</span> <span class="pre">is</span> <span class="pre">a</span> <span class="pre">comment*)</span></code></li>
<li><code class="docutils literal"><span class="pre">A*</span></code> means 0 or more occurrences of A.</li>
<li><code class="docutils literal"><span class="pre">A+</span></code> means 1 or more occurrences of A.</li>
<li><code class="docutils literal"><span class="pre">A</span> <span class="pre">%</span> <span class="pre">B</span></code> means <code class="docutils literal"><span class="pre">A</span> <span class="pre">(B</span> <span class="pre">A)*</span></code> and the <code class="docutils literal"><span class="pre">%</span></code> operator has the highest
precedence. For example: <code class="docutils literal"><span class="pre">term</span> <span class="pre">%</span> <span class="pre">"+"</span> <span class="pre">comment</span></code> is the same as
<code class="docutils literal"><span class="pre">term</span> <span class="pre">("+"</span> <span class="pre">term)*</span> <span class="pre">comment</span></code>.</li>
<li>The colon <code class="docutils literal"><span class="pre">:</span></code> in quoted string means that the string can be shortened, e.g.
<code class="docutils literal"><span class="pre">"del:ete"</span></code> means that any of <code class="docutils literal"><span class="pre">del</span></code>, <code class="docutils literal"><span class="pre">dele</span></code>, <code class="docutils literal"><span class="pre">delet</span></code> and <code class="docutils literal"><span class="pre">delete</span></code>
can be used.</li>
</ul>
<p>The functions that can be used in <code class="docutils literal"><span class="pre">p_expr</span></code> and <code class="docutils literal"><span class="pre">v_expr</span></code> are available
<a class="reference internal" href="data.html#transform"><span class="std std-ref">here</span></a> and <a class="reference internal" href="model.html#variables"><span class="std std-ref">here</span></a>, respectively.
<code class="docutils literal"><span class="pre">v_expr</span></code> contains only a subset of functions from <code class="docutils literal"><span class="pre">p_expr</span></code> (partly,
because we need to calculate symbolical derivatives of <code class="docutils literal"><span class="pre">v_expr</span></code>)</p>
<p><strong>Line structure</strong></p>
<pre>
<strong id="grammar-token-line">line </strong> ::= [<a class="reference internal" href="#grammar-token-statement"><code class="xref docutils literal"><span class="pre">statement</span></code></a>] [<a class="reference internal" href="#grammar-token-comment"><code class="xref docutils literal"><span class="pre">comment</span></code></a>]
<strong id="grammar-token-statement">statement</strong> ::= [Dataset+ ":"] [<a class="reference internal" href="#grammar-token-with_opts"><code class="xref docutils literal"><span class="pre">with_opts</span></code></a>] <a class="reference internal" href="#grammar-token-command"><code class="xref docutils literal"><span class="pre">command</span></code></a> % ";"
<strong id="grammar-token-with_opts">with_opts</strong> ::= "w:ith" (Lname "=" <a class="reference internal" href="#grammar-token-value"><code class="xref docutils literal"><span class="pre">value</span></code></a>) % ","
<strong id="grammar-token-comment">comment </strong> ::= "#" AllChars*
</pre>
<p><strong>Commands</strong></p>
<p>The kCmd* names in the comments correspond to constants in the code.</p>
<pre>
<strong id="grammar-token-command">command</strong> ::= (
"deb:ug" RestOfLine | <em>(*kCmdDebug*)</em>
"def:ine" <a class="reference internal" href="#grammar-token-define"><code class="xref docutils literal"><span class="pre">define</span></code></a> | <em>(*kCmdDefine*)</em>
"del:ete" <a class="reference internal" href="#grammar-token-delete"><code class="xref docutils literal"><span class="pre">delete</span></code></a> | <em>(*kCmdDelete*)</em>
"del:ete" <a class="reference internal" href="#grammar-token-delete_points"><code class="xref docutils literal"><span class="pre">delete_points</span></code></a> | <em>(*kCmdDeleteP*)</em>
"e:xecute" <a class="reference internal" href="#grammar-token-exec"><code class="xref docutils literal"><span class="pre">exec</span></code></a> | <em>(*kCmdExec*)</em>
"f:it" <a class="reference internal" href="#grammar-token-fit"><code class="xref docutils literal"><span class="pre">fit</span></code></a> | <em>(*kCmdFit*)</em>
"g:uess" <a class="reference internal" href="#grammar-token-guess"><code class="xref docutils literal"><span class="pre">guess</span></code></a> | <em>(*kCmdGuess*)</em>
"i:nfo" <a class="reference internal" href="#grammar-token-info_arg"><code class="xref docutils literal"><span class="pre">info_arg</span></code></a> % "," [<a class="reference internal" href="#grammar-token-redir"><code class="xref docutils literal"><span class="pre">redir</span></code></a>] | <em>(*kCmdInfo*)</em>
"l:ua" RestOfLine | <em>(*kCmdLua*)</em>
"=" RestOfLine | <em>(*kCmdLua*)</em>
"pl:ot" [<a class="reference internal" href="#grammar-token-range"><code class="xref docutils literal"><span class="pre">range</span></code></a>] [<a class="reference internal" href="#grammar-token-range"><code class="xref docutils literal"><span class="pre">range</span></code></a>] Dataset* [<a class="reference internal" href="#grammar-token-redir"><code class="xref docutils literal"><span class="pre">redir</span></code></a>] | <em>(*kCmdPlot*)</em>
"p:rint" <a class="reference internal" href="#grammar-token-print_args"><code class="xref docutils literal"><span class="pre">print_args</span></code></a> [<a class="reference internal" href="#grammar-token-redir"><code class="xref docutils literal"><span class="pre">redir</span></code></a>] | <em>(*kCmdPrint*)</em>
"quit" | <em>(*kCmdQuit*)</em>
"reset" | <em>(*kCmdReset*)</em>
"s:et" (Lname "=" <a class="reference internal" href="#grammar-token-value"><code class="xref docutils literal"><span class="pre">value</span></code></a>) % "," | <em>(*kCmdSet*)</em>
"sleep" <a class="reference internal" href="#grammar-token-expr"><code class="xref docutils literal"><span class="pre">expr</span></code></a> | <em>(*kCmdSleep*)</em>
"title" "=" <a class="reference internal" href="#grammar-token-filename"><code class="xref docutils literal"><span class="pre">filename</span></code></a> | <em>(*kCmdTitle*)</em>
"undef:ine" Uname % "," | <em>(*kCmdUndef*)</em>
"use" Dataset | <em>(*kCmdUse*)</em>
"!" RestOfLine | <em>(*kCmdShell*)</em>
Dataset "<" <a class="reference internal" href="#grammar-token-load_arg"><code class="xref docutils literal"><span class="pre">load_arg</span></code></a> | <em>(*kCmdLoad*)</em>
Dataset "=" <code class="xref docutils literal"><span class="pre">dataset_expr</span></code> | <em>(*kCmdDatasetTr*)</em>
Funcname "=" <a class="reference internal" href="#grammar-token-func_rhs"><code class="xref docutils literal"><span class="pre">func_rhs</span></code></a> | <em>(*kCmdNameFunc*)</em>
<a class="reference internal" href="#grammar-token-param_lhs"><code class="xref docutils literal"><span class="pre">param_lhs</span></code></a> "=" <code class="xref docutils literal"><span class="pre">v_expr</span></code> | <em>(*kCmdAssignParam*)</em>
Varname "=" <code class="xref docutils literal"><span class="pre">v_expr</span></code> | <em>(*kCmdNameVar*)</em>
Varname "=" "copy" "(" <a class="reference internal" href="#grammar-token-var_id"><code class="xref docutils literal"><span class="pre">var_id</span></code></a> ")" | <em>(*kCmdNameVar*)</em>
<a class="reference internal" href="#grammar-token-model_id"><code class="xref docutils literal"><span class="pre">model_id</span></code></a> ("="|"+=") <a class="reference internal" href="#grammar-token-model_rhs"><code class="xref docutils literal"><span class="pre">model_rhs</span></code></a> | <em>(*kCmdChangeModel*)</em>
(<a class="reference internal" href="#grammar-token-p_attr"><code class="xref docutils literal"><span class="pre">p_attr</span></code></a> "[" <a class="reference internal" href="#grammar-token-expr"><code class="xref docutils literal"><span class="pre">expr</span></code></a> "]" "=" <code class="xref docutils literal"><span class="pre">p_expr</span></code>) % "," | <em>(*kCmdPointTr*)</em>
(<a class="reference internal" href="#grammar-token-p_attr"><code class="xref docutils literal"><span class="pre">p_attr</span></code></a> "=" <code class="xref docutils literal"><span class="pre">p_expr</span></code>) % "," | <em>(*kCmdAllPointsTr*)</em>
"M" "=" <a class="reference internal" href="#grammar-token-expr"><code class="xref docutils literal"><span class="pre">expr</span></code></a> ) <em>(*kCmdResizeP*)</em>
</pre>
<p><strong>Other rules</strong></p>
<pre>
<strong id="grammar-token-define">define </strong> ::= Uname "(" (Lname [ "=" <code class="xref docutils literal"><span class="pre">v_expr</span></code>]) % "," ")" "="
( <code class="xref docutils literal"><span class="pre">v_expr</span></code> |
<a class="reference internal" href="#grammar-token-component_func"><code class="xref docutils literal"><span class="pre">component_func</span></code></a> % "+" |
"x" "<" <code class="xref docutils literal"><span class="pre">v_expr</span></code> "?" <a class="reference internal" href="#grammar-token-component_func"><code class="xref docutils literal"><span class="pre">component_func</span></code></a> ":" <a class="reference internal" href="#grammar-token-component_func"><code class="xref docutils literal"><span class="pre">component_func</span></code></a>
)
<strong id="grammar-token-component_func">component_func</strong> ::= Uname "(" <code class="xref docutils literal"><span class="pre">v_expr</span></code> % "," ")"
<strong id="grammar-token-delete">delete </strong> ::= (Varname | <a class="reference internal" href="#grammar-token-func_id"><code class="xref docutils literal"><span class="pre">func_id</span></code></a> | Dataset | "file" <a class="reference internal" href="#grammar-token-filename"><code class="xref docutils literal"><span class="pre">filename</span></code></a>) % ","
<strong id="grammar-token-delete_points">delete_points </strong> ::= "(" <code class="xref docutils literal"><span class="pre">p_expr</span></code> ")"
<strong id="grammar-token-exec">exec </strong> ::= <a class="reference internal" href="#grammar-token-filename"><code class="xref docutils literal"><span class="pre">filename</span></code></a> |
"!" RestOfLine |
"=" RestOfLine
<strong id="grammar-token-fit">fit </strong> ::= [Number] [Dataset*] |
"undo" |
"redo" |
"history" Number |
"clear_history"
<strong id="grammar-token-guess">guess </strong> ::= [Funcname "="] Uname ["(" (Lname "=" <code class="xref docutils literal"><span class="pre">v_expr</span></code>) % "," ")"] [<a class="reference internal" href="#grammar-token-range"><code class="xref docutils literal"><span class="pre">range</span></code></a>]
<strong id="grammar-token-info_arg">info_arg </strong> ::= ...TODO
<strong id="grammar-token-print_args">print_args </strong> ::= [("all" | ("if" <code class="xref docutils literal"><span class="pre">p_expr</span></code> ":")]
(<code class="xref docutils literal"><span class="pre">p_expr</span></code> | QuotedString | "title" | "filename") % ","
<strong id="grammar-token-redir">redir </strong> ::= (">"|">>") <a class="reference internal" href="#grammar-token-filename"><code class="xref docutils literal"><span class="pre">filename</span></code></a>
<strong id="grammar-token-value">value </strong> ::= (Lname | QuotedString | <a class="reference internal" href="#grammar-token-expr"><code class="xref docutils literal"><span class="pre">expr</span></code></a>) <em>(*value type depends on the option*)</em>
<strong id="grammar-token-model_rhs">model_rhs </strong> ::= "0" |
<a class="reference internal" href="#grammar-token-func_id"><code class="xref docutils literal"><span class="pre">func_id</span></code></a> |
<a class="reference internal" href="#grammar-token-func_rhs"><code class="xref docutils literal"><span class="pre">func_rhs</span></code></a> |
<a class="reference internal" href="#grammar-token-model_id"><code class="xref docutils literal"><span class="pre">model_id</span></code></a> |
"copy" "(" <a class="reference internal" href="#grammar-token-model_id"><code class="xref docutils literal"><span class="pre">model_id</span></code></a> ")"
<strong id="grammar-token-func_rhs">func_rhs </strong> ::= Uname "(" ([Lname "="] <code class="xref docutils literal"><span class="pre">v_expr</span></code>) % "," ")" |
"copy" "(" <a class="reference internal" href="#grammar-token-func_id"><code class="xref docutils literal"><span class="pre">func_id</span></code></a> ")"
<strong id="grammar-token-load_arg">load_arg </strong> ::= <a class="reference internal" href="#grammar-token-filename"><code class="xref docutils literal"><span class="pre">filename</span></code></a> Lname* |
"."
<strong id="grammar-token-p_attr">p_attr </strong> ::= ("X" | "Y" | "S" | "A")
<strong id="grammar-token-model_id">model_id </strong> ::= [Dataset "."] ("F"|"Z")
<strong id="grammar-token-func_id">func_id </strong> ::= Funcname |
<a class="reference internal" href="#grammar-token-model_id"><code class="xref docutils literal"><span class="pre">model_id</span></code></a> "[" Number "]"
<strong id="grammar-token-param_lhs">param_lhs </strong> ::= Funcname "." Lname |
<a class="reference internal" href="#grammar-token-model_id"><code class="xref docutils literal"><span class="pre">model_id</span></code></a> "[" (Number | "*") "]" "." Lname
<strong id="grammar-token-var_id">var_id </strong> ::= Varname |
<a class="reference internal" href="#grammar-token-func_id"><code class="xref docutils literal"><span class="pre">func_id</span></code></a> "." Lname
<strong id="grammar-token-range">range </strong> ::= "[" [<a class="reference internal" href="#grammar-token-expr"><code class="xref docutils literal"><span class="pre">expr</span></code></a>] ":" [<a class="reference internal" href="#grammar-token-expr"><code class="xref docutils literal"><span class="pre">expr</span></code></a>] "]"
<strong id="grammar-token-filename">filename </strong> ::= QuotedString | NonblankString
</pre>
<p><strong>Mathematical expressions</strong></p>
<pre>
<strong id="grammar-token-expr">expr </strong> ::= expr_or ? expr_or : expr_or
<strong id="grammar-token-expr_or">expr_or </strong> ::= expr_and % "or"
<strong id="grammar-token-expr_and">expr_and </strong> ::= expr_not % "and"
<strong id="grammar-token-expr_not">expr_not </strong> ::= "not" expr_not | comparison
<strong id="grammar-token-comparison">comparison </strong> ::= arith % ("<"|">"|"=="|">="|"<="|"!=")
<strong id="grammar-token-arith">arith </strong> ::= term % ("+"|"-")
<strong id="grammar-token-term">term </strong> ::= factor % ("*"|"/")
<strong id="grammar-token-factor">factor </strong> ::= ('+'|'-') factor | power
<strong id="grammar-token-power">power </strong> ::= atom ['**' factor]
<strong id="grammar-token-atom">atom </strong> ::= Number | "true" | "false" | "pi" |
math_func | braced_expr | ?others?
<strong id="grammar-token-math_func">math_func </strong> ::= "sqrt" "(" expr ")" |
"gamma" "(" expr ")" |
...
<strong id="grammar-token-braced_expr">braced_expr</strong> ::= "{" [Dataset+ ":"] <code class="xref docutils literal"><span class="pre">p_expr</span></code> "}"
</pre>
<p>The <code class="docutils literal"><span class="pre">atom</span></code> rule also accepts some fityk expressions, such as $variable,
%function.parameter, %function(expr), etc.</p>
<p><code class="docutils literal"><span class="pre">p_expr</span></code> and <code class="docutils literal"><span class="pre">v_expr</span></code> are similar to <code class="docutils literal"><span class="pre">expr</span></code>,
but they use additional variables in the <code class="docutils literal"><span class="pre">atom</span></code> rule.</p>
<p><code class="docutils literal"><span class="pre">p_expr</span></code> recognizes <code class="docutils literal"><span class="pre">n</span></code>, <code class="docutils literal"><span class="pre">M</span></code>, <code class="docutils literal"><span class="pre">x</span></code>, <code class="docutils literal"><span class="pre">y</span></code>, <code class="docutils literal"><span class="pre">s</span></code>, <code class="docutils literal"><span class="pre">a</span></code>, <code class="docutils literal"><span class="pre">X</span></code>, <code class="docutils literal"><span class="pre">Y</span></code>,
<code class="docutils literal"><span class="pre">S</span></code> and <code class="docutils literal"><span class="pre">A</span></code>. All of them but <code class="docutils literal"><span class="pre">n</span></code> and <code class="docutils literal"><span class="pre">M</span></code> can be indexed
(e.g. <code class="docutils literal"><span class="pre">x[4]</span></code>). Example: <code class="docutils literal"><span class="pre">(x+x[n-1])/2</span></code>.</p>
<p><code class="docutils literal"><span class="pre">v_expr</span></code> uses all unknown names (<code class="docutils literal"><span class="pre">Lname</span></code>) as variables
(example: <code class="docutils literal"><span class="pre">a+b*x^2</span></code>).
Only a subset of functions (<code class="docutils literal"><span class="pre">math_func</span></code>) from <code class="docutils literal"><span class="pre">expr</span></code> is supported.
The tilde (<code class="docutils literal"><span class="pre">~</span></code>) can be used to create simple-variables (<code class="docutils literal"><span class="pre">~5</span></code>),
optionally with a domain in square brackets (<code class="docutils literal"><span class="pre">~5[1:6]</span></code>).</p>
<p>Since <code class="docutils literal"><span class="pre">v_expr</span></code> is used to define variables and user-defined functions,
the program calculates symbolically derivatives of <code class="docutils literal"><span class="pre">v_expr</span></code>.
That is why not all the function from <code class="docutils literal"><span class="pre">expr</span></code> are supported
(they may be added in the future).</p>
<p><code class="docutils literal"><span class="pre">dataset_expr</span></code> supports very limited set of operators and a few functions
that take Dataset token as argument (example: <code class="docutils literal"><span class="pre">@0</span> <span class="pre">-</span> <span class="pre">shirley_bg(@0)</span></code>).</p>
<p><strong>Lexer</strong></p>
<p>Below, some of the tokens produced by the fityk lexer are defined.</p>
<p>The lexer is context-dependend: <code class="docutils literal"><span class="pre">NonblankString</span></code> and <code class="docutils literal"><span class="pre">RestOfLine</span></code>
are produced only when they are expected in the grammar.</p>
<p><code class="docutils literal"><span class="pre">Uname</span></code> is used only for function types (Gaussian)
and pseudo-parameters (%f.Area).</p>
<pre>
<strong id="grammar-token-Dataset">Dataset </strong> ::= "@"(Digit+|"+"|"*")
<strong id="grammar-token-Varname">Varname </strong> ::= "$" Lname
<strong id="grammar-token-Funcname">Funcname </strong> ::= "%" Lname
<strong id="grammar-token-QuotedString">QuotedString </strong> ::= "'" (AllChars - "'")* "'"
<strong id="grammar-token-Lname">Lname </strong> ::= (LowerCase | "_") (LowerCase | Digit | "_")*
<strong id="grammar-token-Uname">Uname </strong> ::= UpperCase AlphaNum+
<strong id="grammar-token-Number">Number </strong> ::= ?number read by strtod()?
<strong id="grammar-token-NonblankString">NonblankString</strong> ::= (AllChars - (WhiteSpace | ";" | "#" ))*
<strong id="grammar-token-RestOfLine">RestOfLine </strong> ::= AllChars*
</pre>
</div>
</div>
<div class="section" id="fityk-library-api">
<h2>Fityk library API<a class="headerlink" href="#fityk-library-api" title="Permalink to this headline">¶</a></h2>
<p>Fityk comes with embedded Lua interpreter and this language
is used in this section. The API for other supported languages is similar.
Lua communicates with Fityk using object <code class="docutils literal"><span class="pre">F</span></code> of type <code class="docutils literal"><span class="pre">Fityk</span></code>.
To call the methods listed below use <code class="docutils literal"><span class="pre">F:method()</span></code>, for example
<code class="docutils literal"><span class="pre">F:get_dof()</span></code> (not <code class="docutils literal"><span class="pre">Fityk.get_dof()</span></code>).</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>Other supported languages include C++, C, Python, Perl, Ruby and Java.
Except for C, all APIs are similar.</p>
<p>Unlike in built-in Lua, in other cases it is necessary to create
an instance of the Fityk class first. Then you use this object
in the same way as <code class="docutils literal"><span class="pre">F</span></code> is used below.</p>
<p>The <a class="reference external" href="https://github.com/wojdyr/fityk/blob/master/src/fityk.h">fityk.h</a> header file is the best reference.
Additionally, C++ and Python have access to functions from
the <a class="reference external" href="https://github.com/wojdyr/fityk/blob/master/src/ui_api.h">ui_api.h</a> header. These functions are used in command line
versions of fityk (<code class="docutils literal"><span class="pre">cfityk</span></code> or its equivalent – <code class="docutils literal"><span class="pre">samples/cfityk.py</span></code>).</p>
<p class="last">Examples of scripts in all the listed languages and in the <a class="reference external" href="https://github.com/wojdyr/fityk/blob/master/samples/">samples</a>
directory.</p>
</div>
<p>Here is the most general function:</p>
<dl class="method">
<dt id="Fityk.execute">
<code class="descclassname">Fityk.</code><code class="descname">execute</code><span class="sig-paren">(</span><em>cmd</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.execute" title="Permalink to this definition">¶</a></dt>
<dd><p>Executes a fityk command. Example: <code class="docutils literal"><span class="pre">F:execute("fit")</span></code>.</p>
</dd></dl>
<p>The <code class="docutils literal"><span class="pre">%</span></code> operator for the string type is pre-set to support Python-like
formatting:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="o">=</span> <span class="s2">"%d pigs"</span> <span class="o">%</span> <span class="mi">3</span>
<span class="o">=</span> <span class="s2">"%d %s"</span> <span class="o">%</span> <span class="p">{</span><span class="mi">3</span><span class="p">,</span> <span class="s2">"pigs"</span><span class="p">}</span>
</pre></div>
</div>
<div class="section" id="input-output">
<h3>Input / output<a class="headerlink" href="#input-output" title="Permalink to this headline">¶</a></h3>
<dl class="method">
<dt id="Fityk.input">
<code class="descclassname">Fityk.</code><code class="descname">input</code><span class="sig-paren">(</span><em>prompt</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.input" title="Permalink to this definition">¶</a></dt>
<dd><p>Query user. In the CLI user is asked for input in the command line,
and in the GUI in a pop-up box. As a special case,
if the prompt contains string “[y/n]” the GUI shows Yes/No buttons
instead of text entry.</p>
<p>Example: TODO</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.out">
<code class="descclassname">Fityk.</code><code class="descname">out</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.out" title="Permalink to this definition">¶</a></dt>
<dd><p>Print string in the output area. The <code class="docutils literal"><span class="pre">print()</span></code> function in built-in Lua
is redefined to do the same.</p>
</dd></dl>
</div>
<div class="section" id="settings">
<h3>Settings<a class="headerlink" href="#settings" title="Permalink to this headline">¶</a></h3>
<dl class="method">
<dt id="Fityk.set_option_as_string">
<code class="descclassname">Fityk.</code><code class="descname">set_option_as_string</code><span class="sig-paren">(</span><em>opt</em>, <em>val</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.set_option_as_string" title="Permalink to this definition">¶</a></dt>
<dd><p>Set option <em>opt</em> to value <em>val</em>.
Equivalent of fityk command <code class="docutils literal"><span class="pre">set</span> <span class="pre">opt=val</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.set_option_as_number">
<code class="descclassname">Fityk.</code><code class="descname">set_option_as_number</code><span class="sig-paren">(</span><em>opt</em>, <em>val</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.set_option_as_number" title="Permalink to this definition">¶</a></dt>
<dd><p>Set option <em>opt</em> to numeric value <em>val</em>.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_option_as_string">
<code class="descclassname">Fityk.</code><code class="descname">get_option_as_string</code><span class="sig-paren">(</span><em>opt</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_option_as_string" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns value of <em>opt</em> (string).</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_option_as_number">
<code class="descclassname">Fityk.</code><code class="descname">get_option_as_number</code><span class="sig-paren">(</span><em>opt</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_option_as_number" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns value of <em>opt</em> (real number).</p>
</dd></dl>
</div>
<div class="section" id="data">
<h3>Data<a class="headerlink" href="#data" title="Permalink to this headline">¶</a></h3>
<dl class="method">
<dt id="Fityk.load">
<code class="descclassname">Fityk.</code><code class="descname">load</code><span class="sig-paren">(</span><em>spec</em><span class="optional">[</span>, <em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.load" title="Permalink to this definition">¶</a></dt>
<dd><p>Load data to @*d* slot. The first argument is either a string with path
or LoadSpec struct that apart from the <code class="docutils literal"><span class="pre">path</span></code> has also the following
optional members: <code class="docutils literal"><span class="pre">x_col</span></code>, <code class="docutils literal"><span class="pre">y_col</span></code>, <code class="docutils literal"><span class="pre">sig_col</span></code>, <code class="docutils literal"><span class="pre">blocks</span></code>,
<code class="docutils literal"><span class="pre">format</span></code>, <code class="docutils literal"><span class="pre">options</span></code>. The meaning of these parameters is the same
as described in <a class="reference internal" href="data.html#dataload"><span class="std std-ref">Loading Data</span></a>.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.load_data">
<code class="descclassname">Fityk.</code><code class="descname">load_data</code><span class="sig-paren">(</span><em>d</em>, <em>xx</em>, <em>yy</em>, <em>sigmas</em><span class="optional">[</span>, <em>title</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.load_data" title="Permalink to this definition">¶</a></dt>
<dd><p>Load data to @*d* slot. <em>xx</em> and <em>yy</em> must be numeric arrays
of the same size, <em>sigmas</em> must either be empty or have the same size.
<em>title</em> is an optional data title (string).</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.add_point">
<code class="descclassname">Fityk.</code><code class="descname">add_point</code><span class="sig-paren">(</span><em>x</em>, <em>y</em>, <em>sigma</em><span class="optional">[</span>, <em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.add_point" title="Permalink to this definition">¶</a></dt>
<dd><p>Add one data point ((<em>x</em>, <em>y</em>) with std. dev. set to <em>sigma</em>)
to an existing dataset <em>d</em>.
If <em>d</em> is not specified, the default dataset is used.</p>
<p>Example: <code class="docutils literal"><span class="pre">F:add_point(30,</span> <span class="pre">7.5,</span> <span class="pre">1)</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_dataset_count">
<code class="descclassname">Fityk.</code><code class="descname">get_dataset_count</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_dataset_count" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns number of datasets (n >= 1).</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_default_dataset">
<code class="descclassname">Fityk.</code><code class="descname">get_default_dataset</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_default_dataset" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns default dataset. Default dataset is set by the “use @n” command.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_data">
<code class="descclassname">Fityk.</code><code class="descname">get_data</code><span class="sig-paren">(</span><span class="optional">[</span><em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_data" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns points for dataset <em>d</em>.</p>
<ul class="simple">
<li>in C++ – returns vector<Point></li>
<li>in Lua – userdata with array-like methods, indexed from 0.</li>
</ul>
<p>Each point has 4 properties:
<code class="docutils literal"><span class="pre">x</span></code>, <code class="docutils literal"><span class="pre">y</span></code>, <code class="docutils literal"><span class="pre">sigma</span></code> (real numbers) and <code class="docutils literal"><span class="pre">is_active</span></code> (bool).</p>
<p>Example:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="n">points</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">get_data</span><span class="p">()</span>
<span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="o">#</span><span class="n">points</span><span class="o">-</span><span class="mi">1</span> <span class="kr">do</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">points</span><span class="p">[</span><span class="n">i</span><span class="p">]</span>
<span class="kr">if</span> <span class="n">p</span><span class="p">.</span><span class="n">is_active</span> <span class="kr">then</span>
<span class="nb">print</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">p</span><span class="p">.</span><span class="n">x</span><span class="p">,</span> <span class="n">p</span><span class="p">.</span><span class="n">y</span><span class="p">,</span> <span class="n">p</span><span class="p">.</span><span class="n">sigma</span><span class="p">)</span>
<span class="kr">end</span>
<span class="kr">end</span>
</pre></div>
</div>
<div class="highlight-none"><div class="highlight"><pre><span></span>1 4.24 1.06 1
2 6.73 1.39 1
3 8.8 1.61 1
...
</pre></div>
</div>
</dd></dl>
</div>
<div class="section" id="general-info">
<h3>General Info<a class="headerlink" href="#general-info" title="Permalink to this headline">¶</a></h3>
<dl class="method">
<dt id="Fityk.get_info">
<code class="descclassname">Fityk.</code><code class="descname">get_info</code><span class="sig-paren">(</span><em>s</em><span class="optional">[</span>, <em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_info" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns output of the fityk <code class="docutils literal"><span class="pre">info</span></code> command as a string.
If <em>d</em> is not specified, the default dataset is used (the dataset
is relevant for few arguments of the <code class="docutils literal"><span class="pre">info</span></code> command).</p>
<p>Example: <code class="docutils literal"><span class="pre">F:get_info("history")</span></code> – returns a multiline string
containing all fityk commands issued in this session.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.calculate_expr">
<code class="descclassname">Fityk.</code><code class="descname">calculate_expr</code><span class="sig-paren">(</span><em>s</em><span class="optional">[</span>, <em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.calculate_expr" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns output of the fityk <code class="docutils literal"><span class="pre">print</span></code> command as a number.
If <em>d</em> is not specified, the default dataset is used.</p>
<p>Example: <code class="docutils literal"><span class="pre">F:calculate_expr("argmax(y)",</span> <span class="pre">0)</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_view_boundary">
<code class="descclassname">Fityk.</code><code class="descname">get_view_boundary</code><span class="sig-paren">(</span><em>side</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_view_boundary" title="Permalink to this definition">¶</a></dt>
<dd><p>Get coordinates of the plotted rectangle,
which is set by the <code class="docutils literal"><span class="pre">plot</span></code> command.
Return numeric value corresponding to given <em>side</em>, which should be
a letter <code class="docutils literal"><span class="pre">L</span></code>(eft), <code class="docutils literal"><span class="pre">R</span></code>(ight), <code class="docutils literal"><span class="pre">T</span></code>(op) or <code class="docutils literal"><span class="pre">B</span></code>(ottom).</p>
</dd></dl>
</div>
<div class="section" id="model-info">
<h3>Model info<a class="headerlink" href="#model-info" title="Permalink to this headline">¶</a></h3>
<dl class="method">
<dt id="Fityk.get_parameter_count">
<code class="descclassname">Fityk.</code><code class="descname">get_parameter_count</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_parameter_count" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns number of simple-variables (parameters that can be fitted)</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.all_parameters">
<code class="descclassname">Fityk.</code><code class="descname">all_parameters</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.all_parameters" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns array of simple-variables.</p>
<ul class="simple">
<li>in C++ – vector<double></li>
<li>in Lua – userdata with array-like methods, indexed from 0.</li>
</ul>
</dd></dl>
<dl class="method">
<dt id="Fityk.all_variables">
<code class="descclassname">Fityk.</code><code class="descname">all_variables</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.all_variables" title="Permalink to this definition">¶</a></dt>
<dd><blockquote>
<div><p>Returns array of all defined variables.</p>
<ul class="simple">
<li>in C++ – vector<Var*></li>
<li>in Lua – userdata with array-like methods, indexed from 0.</li>
</ul>
</div></blockquote>
<p>Example:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="n">variables</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">all_variables</span><span class="p">()</span>
<span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="o">#</span><span class="n">variables</span><span class="o">-</span><span class="mi">1</span> <span class="kr">do</span>
<span class="n">v</span> <span class="o">=</span> <span class="n">variables</span><span class="p">[</span><span class="n">i</span><span class="p">]</span>
<span class="nb">print</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">v</span><span class="p">.</span><span class="n">name</span><span class="p">,</span> <span class="n">v</span><span class="p">:</span><span class="n">value</span><span class="p">(),</span> <span class="n">v</span><span class="p">.</span><span class="n">domain</span><span class="p">.</span><span class="n">lo</span><span class="p">,</span> <span class="n">v</span><span class="p">.</span><span class="n">domain</span><span class="p">.</span><span class="n">hi</span><span class="p">,</span>
<span class="n">v</span><span class="p">:</span><span class="n">gpos</span><span class="p">(),</span> <span class="n">v</span><span class="p">:</span><span class="n">is_simple</span><span class="p">())</span>
<span class="kr">end</span>
</pre></div>
</div>
<p><code class="docutils literal"><span class="pre">Var.is_simple()</span></code> returns true for simple-variables.</p>
<p><code class="docutils literal"><span class="pre">Var.gpos()</span></code> returns position of the variable in the global array
of parameters (Fityk.all_parameters()), or -1 for compound variables.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_variable">
<code class="descclassname">Fityk.</code><code class="descname">get_variable</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_variable" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns variable <em>$name</em>.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.all_functions">
<code class="descclassname">Fityk.</code><code class="descname">all_functions</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.all_functions" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns array of functions.</p>
<ul class="simple">
<li>in C++ – vector<Func*></li>
<li>in Lua – userdata with array-like methods, indexed from 0.</li>
</ul>
<p>Example:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="n">f</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">all_functions</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span> <span class="c1">-- first functions</span>
<span class="nb">print</span><span class="p">(</span><span class="n">f</span><span class="p">.</span><span class="n">name</span><span class="p">,</span> <span class="n">f</span><span class="p">:</span><span class="n">get_template_name</span><span class="p">())</span> <span class="c1">-- _1 Gaussian</span>
<span class="nb">print</span><span class="p">(</span><span class="n">f</span><span class="p">:</span><span class="n">get_param</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span> <span class="n">f</span><span class="p">:</span><span class="n">get_param</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="c1">-- height center</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"$"</span> <span class="o">..</span> <span class="n">f</span><span class="p">:</span><span class="n">var_name</span><span class="p">(</span><span class="s2">"height"</span><span class="p">))</span> <span class="c1">-- $_4</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"center:"</span><span class="p">,</span> <span class="n">f</span><span class="p">:</span><span class="n">get_param_value</span><span class="p">(</span><span class="s2">"center"</span><span class="p">))</span> <span class="c1">-- center: 24.72235945525</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"f(25)="</span><span class="p">,</span> <span class="n">f</span><span class="p">:</span><span class="n">value_at</span><span class="p">(</span><span class="mi">25</span><span class="p">))</span> <span class="c1">-- f(25)= 4386.95533969</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_function">
<code class="descclassname">Fityk.</code><code class="descname">get_function</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_function" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the function with given <em>name</em>, or NULL if there is no such
function.</p>
<p>Example:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="n">f</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">get_function</span><span class="p">(</span><span class="s2">"_1"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">"f(25)="</span><span class="p">,</span> <span class="n">f</span><span class="p">:</span><span class="n">value_at</span><span class="p">(</span><span class="mi">25</span><span class="p">))</span> <span class="c1">-- f(25)= 4386.95533969</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_components">
<code class="descclassname">Fityk.</code><code class="descname">get_components</code><span class="sig-paren">(</span><em>d</em><span class="optional">[</span>, <em>fz</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_components" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns %functions used in dataset <em>d</em>. If <em>fz</em> is <code class="docutils literal"><span class="pre">Z</span></code>, returns
zero-shift functions.</p>
<p>Example:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="n">func</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">get_components</span><span class="p">(</span><span class="mi">1</span><span class="p">)[</span><span class="mi">3</span><span class="p">]</span> <span class="c1">-- get 4th (index 3) function in @1</span>
<span class="nb">print</span><span class="p">(</span><span class="n">func</span><span class="p">)</span> <span class="c1">-- <Func %_6></span>
<span class="n">vname</span> <span class="o">=</span> <span class="n">func</span><span class="p">:</span><span class="n">var_name</span><span class="p">(</span><span class="s2">"hwhm"</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">vname</span><span class="p">)</span> <span class="c1">-- _21</span>
<span class="n">v</span> <span class="o">=</span> <span class="n">get_variable</span><span class="p">(</span><span class="n">vname</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="n">v</span><span class="p">:</span><span class="n">value</span><span class="p">())</span> <span class="c1">-- <Var $_21> 0.1406587</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_model_value">
<code class="descclassname">Fityk.</code><code class="descname">get_model_value</code><span class="sig-paren">(</span><em>x</em><span class="optional">[</span>, <em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_model_value" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the value of the model for dataset <code class="docutils literal"><span class="pre">@</span></code><em>d</em> at <em>x</em>.</p>
</dd></dl>
</div>
<div class="section" id="fit-statistics">
<h3>Fit statistics<a class="headerlink" href="#fit-statistics" title="Permalink to this headline">¶</a></h3>
<dl class="method">
<dt id="Fityk.get_wssr">
<code class="descclassname">Fityk.</code><code class="descname">get_wssr</code><span class="sig-paren">(</span><span class="optional">[</span><em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_wssr" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns WSSR (weighted sum of squared residuals).</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_ssr">
<code class="descclassname">Fityk.</code><code class="descname">get_ssr</code><span class="sig-paren">(</span><span class="optional">[</span><em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_ssr" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns SSR (sum of squared residuals).</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_rsquared">
<code class="descclassname">Fityk.</code><code class="descname">get_rsquared</code><span class="sig-paren">(</span><span class="optional">[</span><em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_rsquared" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns R-squared.</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_dof">
<code class="descclassname">Fityk.</code><code class="descname">get_dof</code><span class="sig-paren">(</span><span class="optional">[</span><em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_dof" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns the number of degrees of freedom (#points - #parameters).</p>
</dd></dl>
<dl class="method">
<dt id="Fityk.get_covariance_matrix">
<code class="descclassname">Fityk.</code><code class="descname">get_covariance_matrix</code><span class="sig-paren">(</span><span class="optional">[</span><em>d</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#Fityk.get_covariance_matrix" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns covariance matrix.</p>
</dd></dl>
</div>
</div>
<div class="section" id="examples-in-lua">
<h2>Examples in Lua<a class="headerlink" href="#examples-in-lua" title="Permalink to this headline">¶</a></h2>
<p>Show how the peak center moves between datasets:</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="c1">-- file list-max.lua</span>
<span class="n">prev_x</span> <span class="o">=</span> <span class="kc">nil</span>
<span class="kr">for</span> <span class="n">n</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">F</span><span class="p">:</span><span class="n">get_dataset_count</span><span class="p">()</span><span class="o">-</span><span class="mi">1</span> <span class="kr">do</span>
<span class="kd">local</span> <span class="n">path</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">get_info</span><span class="p">(</span><span class="s2">"filename"</span><span class="p">,</span> <span class="n">n</span><span class="p">)</span>
<span class="kd">local</span> <span class="n">filename</span> <span class="o">=</span> <span class="nb">string.match</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s2">"[^/</span><span class="se">\\</span><span class="s2">]+$"</span><span class="p">)</span> <span class="ow">or</span> <span class="s2">""</span>
<span class="c1">-- local x = F:calculate_expr("argmax(y)", n)</span>
<span class="kd">local</span> <span class="n">x</span> <span class="o">=</span> <span class="n">F</span><span class="p">:</span><span class="n">calculate_expr</span><span class="p">(</span><span class="s2">"F[0].center"</span><span class="p">,</span> <span class="n">n</span><span class="p">)</span>
<span class="n">s</span> <span class="o">=</span> <span class="nb">string.format</span><span class="p">(</span><span class="s2">"%s: max at x=%.4f"</span><span class="p">,</span> <span class="n">filename</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span>
<span class="kr">if</span> <span class="n">prev_x</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">s</span> <span class="o">..</span> <span class="nb">string.format</span><span class="p">(</span><span class="s2">" (%+.4f)"</span><span class="p">,</span> <span class="n">x</span><span class="o">-</span><span class="n">prev_x</span><span class="p">)</span>
<span class="kr">end</span>
<span class="n">prev_x</span> <span class="o">=</span> <span class="n">x</span>
<span class="nb">print</span><span class="p">(</span><span class="n">s</span><span class="p">)</span>
<span class="kr">end</span>
</pre></div>
</div>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>exec list-max.lua
frame-000.dat: max at x=-0.0197
frame-001.dat: max at x=-0.0209 (-0.0012)
frame-002.dat: max at x=-0.0216 (-0.0007)
frame-003.dat: max at x=-0.0224 (-0.0008)
</pre></div>
</div>
<p>Write to file values of the model F(x) at chosen x’s
(in this example x = 0, 1.5, 3, … 150):</p>
<div class="highlight-lua"><div class="highlight"><pre><span></span><span class="c1">-- file tabular-f.lua</span>
<span class="n">file</span> <span class="o">=</span> <span class="nb">io.open</span><span class="p">(</span><span class="s2">"output.dat"</span><span class="p">,</span> <span class="s2">"w"</span><span class="p">)</span>
<span class="kr">for</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">150</span><span class="p">,</span> <span class="mf">1.5</span> <span class="kr">do</span>
<span class="n">file</span><span class="p">:</span><span class="n">write</span><span class="p">(</span><span class="nb">string.format</span><span class="p">(</span><span class="s2">"%g</span><span class="se">\t</span><span class="s2">%g</span><span class="se">\n</span><span class="s2">"</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">F</span><span class="p">:</span><span class="n">get_model_value</span><span class="p">(</span><span class="n">x</span><span class="p">)))</span>
<span class="kr">end</span>
<span class="n">file</span><span class="p">:</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
<div class="highlight-fityk"><div class="highlight"><pre><span></span><span class="gp">=-> </span>exec tabular-f.lua
<span class="gp">=-> </span>!head -5 output.dat
0 12.1761
1.5 12.3004
3 10.9096
4.5 9.12635
6 8.27044
</pre></div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
<div class="sphinxsidebarwrapper">
<p class="logo">
<a href="http://fityk.nieto.pl/">
<img class="logo" src="_static/fityk-logo.png" alt="Logo"/>
</a>
<br/ >curve fitting, data analysis
</p>
<h3><a href="fityk-manual.html">Manual</a></h3>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="intro.html">Introduction</a></li>
<li class="toctree-l1"><a class="reference internal" href="getstarted.html">Getting Started</a></li>
<li class="toctree-l1"><a class="reference internal" href="data.html">Data</a></li>
<li class="toctree-l1"><a class="reference internal" href="model.html">Models</a></li>
<li class="toctree-l1"><a class="reference internal" href="fit.html">Curve Fitting</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">Scripts</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#working-with-scripts">Working with Scripts</a></li>
<li class="toctree-l2"><a class="reference internal" href="#fityk-dsl">Fityk DSL</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#grammar">Grammar</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="#fityk-library-api">Fityk library API</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#input-output">Input / output</a></li>
<li class="toctree-l3"><a class="reference internal" href="#settings">Settings</a></li>
<li class="toctree-l3"><a class="reference internal" href="#data">Data</a></li>
<li class="toctree-l3"><a class="reference internal" href="#general-info">General Info</a></li>
<li class="toctree-l3"><a class="reference internal" href="#model-info">Model info</a></li>
<li class="toctree-l3"><a class="reference internal" href="#fit-statistics">Fit statistics</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="#examples-in-lua">Examples in Lua</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="ref.html">All the Rest</a></li>
</ul>
<ul>
<li class="toctree-l1">
<a class="reference external" href="https://github.com/wojdyr/fityk/wiki">Wiki</a>
</li>
</ul>
<div id="searchbox" role="search">
<form class="search" action="search.html" method="get">
<input type="text" name="q" size="12" />
<input type="submit" value="Search" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="related" role="navigation" aria-label="related navigation">
Next: <a href="ref.html">All the Rest</a>
</div>
<div class="footer" role="contentinfo">
Updated on 2017-09-26 with Sphinx 1.6.5.
| <a href="https://github.com/wojdyr/fityk/blob/master/doc/script.rst"
rel="nofollow">Edit on GitHub</a>
</div>
</body>
</html>
|