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<b class="current">Introduction to PyXPlot</b>
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<div><h1 id="a0000000002">1 Introduction to PyXPlot</h1>
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<div class="contents part-contents"><!--<strong>Subsections</strong>-->
<ul>
<li><a href="ch-introduction.html">1 Introduction</a>
   <ul>
   <li><a href="sect0002.html">1.1 PyXPlot’s Heritage: Gnuplot</a>
       
   </li><li><a href="sect0003.html">1.2 The Structure of this Manual</a>
       
   </li><li><a href="sect0004.html">1.3 A Whirlwind Tour</a>
       
   </li><li><a href="sect0005.html">1.4 Acknowledgments</a>
       
   </li><li><a href="sect0006.html">1.5 License</a>
       
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</li><li><a href="ch-installation.html">2 Installation</a>
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   <li><a href="sect0007.html">2.1 System Requirements</a>
       
   </li><li><a href="sect0008.html">2.2 Installation</a>
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       <li><a href="sect0009.html">2.2.1 Installation within Linux Distributions</a>
           
       </li><li><a href="sect0010.html">2.2.2 Installation as User</a>
           
       </li><li><a href="sect0011.html">2.2.3 System-wide Installation</a>
           
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   <li><a href="box-CommandHistory.html">3.1 Getting Started</a>
       
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   </li><li><a href="sect0012.html">3.3 Comments</a>
       
   </li><li><a href="sect0013.html">3.4 Splitting Long Commands</a>
       
   </li><li><a href="sect0014.html">3.5 Printing Text</a>
       
   </li><li><a href="sec-latex_incompatibility.html">3.6 Axis Labels and Titles</a>
       
   </li><li><a href="sect0015.html">3.7 Querying the Values of Settings</a>
       
   </li><li><a href="sec-plot_datafiles.html">3.8 Plotting Datafiles</a>
       
   </li><li><a href="sect0016.html">3.9 Plotting Many Datafiles at Once</a>
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       <li><a href="sec-horizontal_datafiles.html">3.9.1 Horizontally arranged Datafiles</a>
           
       </li><li><a href="sec-select_modifier.html">3.9.2 Choosing which Data to Plot</a>
           
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   </li><li><a href="sec-replot.html">3.10 The <tt class="tt">replot</tt> Command</a>
       
   </li><li><a href="sec-directing_output.html">3.11 Directing Where Output Goes</a>
       
   </li><li><a href="sect0017.html">3.12 Setting the Size of Output</a>
       
   </li><li><a href="sec-pointtype.html">3.13 Plotting Styles</a>
       
   </li><li><a href="ex-axislab.html">3.14 Setting Axis Ranges</a>
       
   </li><li><a href="sect0018.html">3.15 Interactive Help</a>
       
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</li><li><a href="sect0019.html">4 Performing Calculations</a>
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   <li><a href="sect0020.html">4.1 Variables</a>
       
   </li><li><a href="sec-constants.html">4.2 Physical Constants</a>
       
   </li><li><a href="sec-functions.html">4.3 Functions</a>
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       <li><a href="ex-funcsplice.html">4.3.1 Spliced Functions</a>
           
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   </li><li><a href="sec-num_errs.html">4.4 Handling Numerical Errors</a>
       
   </li><li><a href="sec-complex_numbers.html">4.5 Working with Complex Numbers</a>
       
   </li><li><a href="sec-units.html">4.6 Working with Physical Units</a>
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       <li><a href="sec-angles.html">4.6.1 Treatment of Angles in PyXPlot</a>
           
       </li><li><a href="sect0021.html">4.6.2 Converting between different Temperature Scales</a>
           
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   </li><li><a href="sec-unitdisp.html">4.7 Configuring how Numbers are Displayed</a>
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       <li><a href="sect0022.html">4.7.1 Units</a>
           
       </li><li><a href="sect0023.html">4.7.2 Changing the Accuracy to which Numbers are Displayed</a>
           
       </li><li><a href="sec-pastable.html">4.7.3 Creating Pastable Text</a>
           
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   </li><li><a href="ex-calculus.html">4.8 Numerical Integration and Differentiation</a>
       
   </li><li><a href="sect0024.html">4.9 Solving Systems of Equations</a>
       
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       <li><a href="sect0025.html">4.11.1 Time Intervals</a>
           
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</li><li><a href="ch-numerics.html">5 Working with Data</a>
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   <li><a href="sec-filters.html">5.1 Input Filters</a>
       
   </li><li><a href="sect0026.html">5.2 Reading Data from a Pipe</a>
       
   </li><li><a href="sect0027.html">5.3 Including Data within Command Scripts</a>
       
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   </li><li><a href="sec-tabulate.html">5.5 Tabulating Functions and Slicing Data Files</a>
       
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   </li><li><a href="ex-interpolation.html">5.7 Datafile Interpolation</a>
       
   </li><li><a href="sect0028.html">5.8 Fourier Transforms</a>
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       <li><a href="sect0029.html">5.8.1 Window Functions</a>
           
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   </li><li><a href="sec-histogram.html">5.9 Histograms</a>
       
   </li><li><a href="sect0030.html">5.10 Random Data Generation</a>
       
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</li><li><a href="sect0031.html">6 Programming and Flow Control</a>
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   <li><a href="sec-stringvars.html">6.1 String Variables</a>
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       <li><a href="sec-stringsubop.html">6.1.1 The String Substitution Operator</a>
           
       </li><li><a href="sect0032.html">6.1.2 Regular Expressions</a>
           
       </li><li><a href="sect0033.html">6.1.3 String Manipulation Functions</a>
           
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   </li><li><a href="sect0034.html">6.2 Conditionals</a>
       
   </li><li><a href="sect0035.html">6.3 For Loops</a>
       
   </li><li><a href="sect0036.html">6.4 Foreach Loops</a>
       
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   </li><li><a href="sec-breakcontinue.html">6.7 The <tt class="tt">break</tt> and <tt class="tt">continue</tt> statements</a>
       
   </li><li><a href="sect0038.html">6.8 Conditional Functions</a>
       
   </li><li><a href="ex-pendulum.html">6.9 Subroutines</a>
       
   </li><li><a href="ex-macro.html">6.10 Macros</a>
       
   </li><li><a href="sect0039.html">6.11 The <tt class="tt">exec</tt> command<a name="a0000000601" id="a0000000601"></a></a>
       
   </li><li><a href="sect0040.html">6.12 Assertions</a>
       
   </li><li><a href="sect0041.html">6.13 Shell Commands</a>
       
   </li><li><a href="sect0042.html">6.14 Script Watching: pyxplot_watch</a>
       
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