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<title>stat_r.c -- statistical operations</title>
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<h2>stat_r.c -- statistical operations</h2>
<blockquote>
<p>Qhull records many statistics. These functions and
macros make it inexpensive to add a statistic.
<p>As with Qhull's global variables, the statistics data structure is
accessed by a macro, 'qhstat'. If qh_QHpointer is defined, the macro
is 'qh_qhstat->', otherwise the macro is 'qh_qhstat.'.
Statistics
may be turned off in user_r.h. If so, all but the 'zz'
statistics are ignored.</p>
</blockquote>
<p><b>Copyright © 1995-2015 C.B. Barber</b></p>
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<h3>Index to <a href="stat_r.c">stat_r.c</a> and
<a href="stat_r.h">stat_r.h</a></h3>
<ul>
<li><a href="#ttype">stat_r.h types</a> </li>
<li><a href="#tconst">stat_r.h constants</a> </li>
<li><a href="#tmacro">stat_r.h macros</a> </li>
<li><a href="#tfunc">stat_r.c functions</a> </li>
</ul>
<h3><a href="qh-stat_r.htm#TOC">»</a><a name="ttype">stat_r.h types</a></h3>
<ul>
<li><a href="stat_r.h#intrealT">intrealT</a> union of
integer and real</li>
<li><a href="stat_r.h#qhstat">qhstat</a> global data
structure for statistics </li>
</ul>
<h3><a href="qh-stat_r.htm#TOC">»</a><a name="tconst">stat_r.h
constants</a></h3>
<ul>
<li><a href="stat_r.h#KEEPstatistics">qh_KEEPstatistics</a> 0 turns off most statistics</li>
<li><a href="stat_r.h#statistics">Z..., W...</a> integer (Z) and real (W) statistics
</li>
<li><a href="stat_r.h#ZZstat">ZZstat</a> Z.../W... statistics that
remain defined if qh_KEEPstatistics=0
</li>
<li><a href="stat_r.h#ztype">ztype</a> zdoc, zinc, etc.
for definining statistics </li>
</ul>
<h3><a href="qh-stat_r.htm#TOC">»</a><a name="tmacro">stat_r.h macros</a></h3>
<ul>
<li><a href="stat_r.h#MAYdebugx">MAYdebugx</a> called
frequently for error trapping </li>
<li><a href="stat_r.h#zadd_">zadd_/wadd_</a> add value
to an integer or real statistic </li>
<li><a href="stat_r.h#zdef_">zdef_</a> define a
statistic </li>
<li><a href="stat_r.h#zinc_">zinc_</a> increment an
integer statistic </li>
<li><a href="stat_r.h#zmax_">zmax_/wmax_</a> update
integer or real maximum statistic </li>
<li><a href="stat_r.h#zmin_">zmin_/wmin_</a> update
integer or real minimum statistic </li>
<li><a href="stat_r.h#zval_">zval_/wval_</a> set or
return value of a statistic </li>
</ul>
<h3><a href="qh-stat_r.htm#TOC">»</a><a name="tfunc">stat_r.c
functions</a></h3>
<ul>
<li><a href="stat_r.c#allstatA">qh_allstatA</a> define
statistics in groups of 20 </li>
<li><a href="stat_r.c#allstatistics">qh_allstatistics</a>
reset printed flag for all statistics </li>
<li><a href="stat_r.c#collectstatistics">qh_collectstatistics</a>
collect statistics for qh.facet_list </li>
<li><a href="stat_r.c#initstatistics">qh_initstatistics</a>
allocate and initialize statistics </li>
<li><a href="stat_r.c#newstats">qh_newstats</a> returns
True if statistics for zdoc </li>
<li><a href="stat_r.c#nostatistic">qh_nostatistic</a>
true if no statistic to print </li>
<li><a href="stat_r.c#printallstatistics">qh_printallstatistics</a>
print all statistics </li>
<li><a href="stat_r.c#printstatistics">qh_printstatistics</a>
print statistics to a file </li>
<li><a href="stat_r.c#printstatlevel">qh_printstatlevel</a>
print level information for a statistic </li>
<li><a href="stat_r.c#printstats">qh_printstats</a>
print statistics for a zdoc group </li>
<li><a href="stat_r.c#stddev">qh_stddev</a> compute the
standard deviation and average from statistics </li>
</ul>
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