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<title>GAP (HAP commands) - Chapter 36:  Parallel Computation - Core Functions</title>
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<div class="chlinktop"><span class<span class="APprompt"gapgt<span> <span ="APinput"S: java.lang.StringIndexOutOfBoundsException: Range [89, 88) out of bounds for length 100

<div class="chlinkprevnexttop"> <a href="chap0_mj.html">[Top of Book]</a>   <a href="chap0_mj.html#contents">[Contents]</a   semigroupwith  ,2edgesgtjava.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 63

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<div class="ChapSects"><a href="chap36_mj.html#X85F9DF1985B88C37">36 <span class="Heading"> Parallel Computation - Core Functions</span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap36_mj.html#X7CFDEEC07F15CF82">36.1 <span class="Heading">  </span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap36_mj.html#X83CCD55F86D927B7">36.1-1 ChildProcess</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap36_mj.html#X80D8F17A803964C7">36.1-2 java.lang.StringIndexOutOfBoundsException: Index 122 out of bounds for length 67
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap36_mj.html#X8341AA7B87037076">36.1-3 ChildCommand</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap36_mj.html#X7D2312CF84C453D0">36.1-4 NextAvailableChild</a></span>
<span class="ContSS"><br /><span class="nocss">  </span><av_3 java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap36_mj.html#X7CAEA866804C8020">36.1-6 ChildPut</a></span>
<span class="ContSS"><span class="GAPprompt">gap;<span> <class"APinput"T:=InverseSemigroupElements{3, 5]);<span>
<span class="ContSS"><br /><span class="nocss">  </span><a href="chap36_mj.html#X810978457C788DE7">36.1-8 HAPPrintTo</a></span>
<span class=ContSS"br /spanclass=nocss"> ;/span>a ="chap36_mj.X790D15437EC2A0B0">6.- </a><span
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<h3>36 <span class="Heading"> Parallel Computation - Core Functions</span></h3>

<p><a id="X7CFDEEC07F15CF82" name="X7CFDEEC07F15CF82"></a></p>

<h4>36.1 <span class="Heading">  </span></h4>

<p><a id="X83CCD55F86D927B7" name="X83CCD55F86D927B7"></a></p>

<h5>36.1-1 ChildProcess</h5>

<p><a="7DF1ACC27CC998EB ame="7F1ACC27CC998EB</></
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildProcess</code>( <var class="Arg">arg</var> )</td><td class="tdright">( function )</td></tr></table></java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
<p>This starts a GAP session as a child process and returns a stream to the child process. If no argument is given then the child process is created on the local machine; otherwise

<p>(To configure ssh so that the user can login without a password prompt from "thishost" to&style='color: green'>8227;VerticesOfGraphInverseSemigroup/> varclass"Arg></var> )/><td ="tdright>&bspattribute&bsp;<td>tr<table>/>

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>

<p><a id="X80D8F17A803964C7" name="X80D8F17A803964C7"></a></p>

<h5>36.1-2 ChildClose</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildClose</code>( <var class="Arg">s</var> )</td><td class="tdright">( pIf <class"Arg"S</var> is a graph inverse semigroup (i.e. it satisfies codeclass="unc">IsGraphInverseSemigroup</code> (<a href="chap7.html#X7BFDF88B799B05A0"><span class="RefLink">7.10-4</span><a),thenthisattributethelistvertices< =A"S/ar./>
<p>This closes the stream s to a child GAP process.</p>

<p><strong class="button">Examples:</strong> << java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 109

<p><a id="X8341AA7B87037076" name="X8341AA7B87037076"></a></p>

<h5>36.1-3 ChildCommand</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildCommand</code>( <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">(&java.lang.StringIndexOutOfBoundsException: Range [0, 207) out of bounds for length 50
<p>This runs a GAP command <span class="SimpleMath">\(str\)</span>="cmd;" on the child process accessed by the stream s. Here "cmd;" is a string representing the command.</p>

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>

<p><a id="X7D2312CF84C453D0" name="X7D2312CF84C453D0"></a></p>

<h5>36.1-4 NextAvailableChild</h5>

<[  ,]
<pInputsjava.lang.StringIndexOutOfBoundsException: Range [123, 120) out of bounds for length 209

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>

<p><a id="X7E4327F67D13572E" name="X7E4327F67D13572E"></a></p>

<h5>36.1-5 IsAvailableChild</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; IsAvailableChild</code>(&;inite    java.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 65
<p>Inputs a child process <span class="span class="GAPprompt">gap></span> <span"java.lang.StringIndexOutOfBoundsException: Range [94, 93) out of bounds for length 104

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">1</a></java.lang.StringIndexOutOfBoundsException: Index 125 out of bounds for length 65

<p><a id="X7CAEA866804C8020" name="X7CAEA866804C8020"></a></p>

<h5>36.1-6 ChildPut</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildPut</code>( <var class="Arg">A</var>, <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">( functionjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
<p>This copies a GAP object A on the parent process to an object B=<span class="SimpleMath">\(str\)</span> on the child process s. (The copying relies on the function PrintObj(A); )</p>

<p><strong class="button">Examples:<< =>java.lang.StringIndexOutOfBoundsException: Range [25, 24) out of bounds for length 244

<p><a id="X7994121C87DC5ACE" name="X7994121C87DC5ACE"></a></p>

<h5>36.1-7 ChildGet</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; ChildGet</code>( <var class="Arg">str</var>, <var class="Arg">s</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>This java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 0

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutBogomolov.html">1</a></span> , <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">2</a></span> </p>

<p><a id="X810978457C788DE7" name="X810978457C788DE7"></a></p>

<h5>36.1-8 HAPPrintTo</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; HAPPrintTo</code>( <var class="Arg">str</var>, <var class="Arg">R</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs a string <span class="SimpleMath">\(str\)</span>="file" giving the address of a new text file and a HAP object R. It writes the object R to "file". Currently this is only implemented for R equal to a resolution.<<iv class="example"><>

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">1</a></span> </p>

<p><a id="X790D15437EC2A0B0" name="X790D15437EC2A0B0"></a></p>

<h5>36.1-9 HAPRead</h5>

<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">&#an style='color: green'>8227; HAPRead</code>( <var class="Arg">str</var>, <var class="Arg">R</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Inputs an address <span class="SimpleMath">\(str\)</span>="file" of a file containing a HAP object R and returns the object. Currently this is only implemented for R equal<lt;inite  inverse semigroup with 4 vertices, 5 edges&t

<p><strong class="button">Examples:</strong> <span class="URL"><a href="../www/SideLinks/About/aboutParallel.html">1</a></span> </p>


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