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<div class="ChapSects"><a href="chap3_mj.html#X7D9044767BEB1523">3 <span class="Heading">Global Variables</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap3_mj.html#X86AC0C6B807BEBDE">3.1 <span class="Heading">Getting information about polymake
output</span></a>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3_mj.html#X85BA7A3D7C698B68">3.1-1 InfoPolymaking</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3_mj.html#X79E1C63D8516D334">3.1-2 POLYMAKE_LAST_FAIL_REASON</a></span>
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<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap3_mj.html#X7B786DAF80136FF4">3.2 <span class="Heading">Variables for system interaction</span></a>
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<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3_mj.html#X7B35A5217C8C7B04">3.2-1 POLYMAKE_COMMAND</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap3_mj.html#X7C07B16B873BA46D">3.2-2 POLYMAKE_DATA_DIR</a></span>
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<h3>3 <span class="Heading">Global Variables</span></h3>

<p><a id="X86AC0C6B807BEBDE" name="X86AC0C6B807BEBDE"></a></p>

<h4>3.1 <span class="Heading">Getting information about polymake
output</span></h4>

<p><a id="X85BA7A3D7C698B68" name="X85BA7A3D7C698B68"></a></p>

<h5>3.1-1 InfoPolymaking</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ InfoPolymaking</code></td><td class="tdright">( info class )</td></tr></table></div>
<p>If set to at least <span class="SimpleMath">\(2\)</span>, the output of polymake is shown. At level <span class="SimpleMath">\(1\)</span>, warnings are shown. This is the default. And at level <span class="SimpleMath">\(0\)</span>, the polymake package remains silent.</p>

<p><a id="X79E1C63D8516D334" name="X79E1C63D8516D334"></a></p>

<h5>3.1-2 POLYMAKE_LAST_FAIL_REASON</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ POLYMAKE_LAST_FAIL_REASON</code></td><td class="tdright">( global variable )</td></tr></table></div>
<p>Contains a string that explains the last occurrence of <code class="keyw">fail</code> as a return value of <code class="func">Polymake</code> (<a href="chap2_mj.html#X7DBA99E87EC51D53"><span class="RefLink">2.5-1</span></a>).</p>

<p><a id="X7B786DAF80136FF4" name="X7B786DAF80136FF4"></a></p>

<h4>3.2 <span class="Heading">Variables for system interaction</span></h4>

<p>The variables for interaction with the system are contained in the file <code class="file">environment.gi</code>. Each of these variables has a function to set it, see <a href="chap1_mj.html#X851C596486F918F0"><span class="RefLink">1.2</span></a>. If <code class="keyw">POLYMAKE_COMMAND</code> or <code class="keyw">POLYMAKE_DATA_DIR</code> are set at startup, they are not overwritten. So if you don't want (or don't have the rights) to modify <code class="file">environment.gi</code>, you can set the variables in your <code class="file">.gaprc</code> file.</p>

<p><a id="X7B35A5217C8C7B04" name="X7B35A5217C8C7B04"></a></p>

<h5>3.2-1 POLYMAKE_COMMAND</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ POLYMAKE_COMMAND</code></td><td class="tdright">( global variable )</td></tr></table></div>
<p>This variable should contain the name of the polymake program in the form as returned by <code class="code">Filename</code> So a probable value is <code class="code">Filename(Directory("/usr/local/bin"),"polymake")</code>.</p>

<p><a id="X7C07B16B873BA46D" name="X7C07B16B873BA46D"></a></p>

<h5>3.2-2 POLYMAKE_DATA_DIR</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ POLYMAKE_DATA_DIR</code></td><td class="tdright">( global variable )</td></tr></table></div>
<p>In this directory the files for polymake will be created. By default, this generates a temporary directory using <code class="keyw">DirectoryTemporary</code></p>


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