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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>comedi_to_physical</title><link rel="stylesheet" type="text/css" href="comedilib.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Comedi"><link rel="up" href="functionreference.html#idm2224" title="5.4.1. Core Functions"><link rel="prev" href="func-ref-comedi-to-phys.html" title="comedi_to_phys"><link rel="next" href="func-ref-comedi-unlock.html" title="comedi_unlock"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">comedi_to_physical</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="func-ref-comedi-to-phys.html">Prev</a> </td><th width="60%" align="center">5.4.1. Core Functions</th><td width="20%" align="right"> <a accesskey="n" href="func-ref-comedi-unlock.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="func-ref-comedi-to-physical"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>comedi_to_physical — convert sample to physical units using polynomials</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <comedilib.h></pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">double <b class="fsfunc">comedi_to_physical</b>(</code></td><td>lsampl_t <var class="pdparam">data</var>, </td></tr><tr><td> </td><td>const comedi_polynomial_t * <var class="pdparam">conversion_polynomial</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idm3516"></a><h2>
Description
</h2><p>
Converts <em class="parameter"><code>data</code></em> given in Comedi's integer
sample values (<span class="type">lsampl_t</span>, between <code class="literal">0</code> and
maxdata) into physical units (<span class="type">double</span>). The
<em class="parameter"><code>conversion_polynomial</code></em>
parameter is obtained from either
<code class="function"><a class="link" href="func-ref-comedi-get-hardcal-converter.html" title="comedi_get_hardcal_converter">comedi_get_hardcal_converter</a></code> or
<code class="function"><a class="link" href="func-ref-comedi-get-softcal-converter.html" title="comedi_get_softcal_converter">comedi_get_softcal_converter</a></code>.
No range checking of the
input <em class="parameter"><code>data</code></em> is performed. It is up to
you to check for <em class="parameter"><code>data</code></em> values of
0 or maxdata if you want to detect possibly out-of-range readings.
</p></div><div class="refsect1"><a name="idm3530"></a><h2>
Return value
</h2><p>
Physical value corresponding to the input sample value.
</p><p>
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