<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>psb_gather — Gather Global Dense Matrix</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="TeX4ht (https://tug.org/tex4ht/)"> <meta name="originator" content="TeX4ht (https://tug.org/tex4ht/)"> <!-- html,3 --> <meta name="src" content="userhtml.tex"> <link rel="stylesheet" type="text/css" href="userhtml.css"> </head><body > <!--l. 351--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu31.html" >next</a>] [<a href="userhtmlsu27.html" >prev</a>] [<a href="userhtmlsu27.html#tailuserhtmlsu27.html" >prev-tail</a>] [<a href="userhtmlse5.html#tailuserhtmlsu28.html">tail</a>] [<a href="userhtmlsu28.html#userhtmlsu30.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">5.3 </span> <a id="x38-750005.3"></a>psb_gather — Gather Global Dense Matrix</h4> <!--l. 353--><p class="noindent" >These subroutines collect the portions of global dense matrix distributed over all process into one single array stored on one process. <center class="par-math-display" > <img src="userhtml27x.png" alt="glob-x ← collect(loc-xi) " class="par-math-display" ></center> <!--l. 357--><p class="nopar" > where: <dl class="description"><dt class="description"> <span class="cmmi-10">glob</span>_<span class="cmmi-10">x</span> </dt><dd class="description">is the global submatrix <span class="cmmi-10">glob</span>_<span class="cmmi-10">x</span><sub><span class="cmr-7">1:</span><span class="cmmi-7">m,</span><span class="cmr-7">1:</span><span class="cmmi-7">n</span></sub> </dd><dt class="description"> <span class="cmmi-10">loc</span>_<span class="cmmi-10">x</span><sub><span class="cmmi-7">i</span></sub> </dt><dd class="description">is the local portion of global dense matrix on process <span class="cmmi-10">i</span>. </dd><dt class="description"> <span class="cmmi-10">collect</span> </dt><dd class="description">is the collect function.</dd></dl> <div class="table"> <!--l. 366--><p class="indent" > <a id="x38-75001r19"></a><hr class="float"><div class="float" > <div class="center" > <!--l. 367--><p class="noindent" > <div class="tabular"> <table id="TBL-21" class="tabular" cellspacing="0" cellpadding="0" ><colgroup id="TBL-21-1g"><col id="TBL-21-1"><col id="TBL-21-2"></colgroup><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-21-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-1-1" class="td11"><span class="cmmi-10">x</span><sub><span class="cmmi-7">i</span></sub><span class="cmmi-10">,y </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-21-1-2" class="td11"><span class="cmbx-10">Subroutine</span></td> </tr><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-21-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-2-1" class="td11">Integer </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-2-2" class="td11">psb_gather </td> </tr><tr style="vertical-align:baseline;" id="TBL-21-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-3-1" class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-3-2" class="td11">psb_gather </td> </tr><tr style="vertical-align:baseline;" id="TBL-21-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-4-1" class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-4-2" class="td11">psb_gather </td> </tr><tr style="vertical-align:baseline;" id="TBL-21-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-5-1" class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-21-5-2" class="td11">psb_gather </td> </tr><tr style="vertical-align:baseline;" id="TBL-21-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-6-1" class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-21-6-2" class="td11">psb_gather </td> </tr><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-21-7-"><td style="white-space:nowrap; text-align:left;" id="TBL-21-7-1" class="td11"> </td></tr></table></div></div> <br /> <div class="caption" ><span class="id">Table 19: </span><span class="content">Data types</span></div><!--tex4ht:label?: x38-75001r19 --> </div><hr class="endfloat" /> </div> <!--l. 383--><p class="noindent" ><span class="lstinline"></span><span class="cmtt-10">call</span><span class="cmtt-10"> </span><span class="cmtt-10">psb_gather</span><span class="cmtt-10">(</span><span class="cmtt-10">glob_x</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">loc_x</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">desc_a</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">info</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">root</span><span class="cmtt-10">)</span> <span class="lstinline"></span><span class="cmtt-10">call</span><span class="cmtt-10"> </span><span class="cmtt-10">psb_gather</span><span class="cmtt-10">(</span><span class="cmtt-10">glob_x</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">loc_x</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">desc_a</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">info</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">root</span><span class="cmtt-10">)</span> <dl class="description"><dt class="description"> <span class="cmbx-10">Type:</span> </dt><dd class="description">Synchronous. </dd><dt class="description"> <span class="cmbx-10">On Entry</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">loc</span><span class="cmbx-10">_x</span> </dt><dd class="description">the local portion of global dense matrix <span class="cmmi-10">glob</span>_<span class="cmmi-10">x</span>. <br class="newline" />Scope: <span class="cmbx-10">local </span><br class="newline" />Type: <span class="cmbx-10">required</span><br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: a rank one or two array or an object of type <a href="userhtmlsu7.html#vdata"><span class="cmtt-10">psb</span><span class="cmtt-10">_T</span><span class="cmtt-10">_vect</span><span class="cmtt-10">_type</span></a> indicated in Table <a href="#x38-75001r19">19<!--tex4ht:ref: tab:gather --></a>. </dd><dt class="description"> <span class="cmbx-10">desc</span><span class="cmbx-10">_a</span> </dt><dd class="description">contains data structures for communications.<br class="newline" />Scope: <span class="cmbx-10">local </span><br class="newline" />Type: <span class="cmbx-10">required</span><br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: a structured data of type <a href="userhtmlsu5.html#descdata"><span class="cmtt-10">psb</span><span class="cmtt-10">_desc</span><span class="cmtt-10">_type</span></a>. </dd><dt class="description"> <span class="cmbx-10">root</span> </dt><dd class="description">The process that holds the global copy. If <span class="cmmi-10">root </span>= <span class="cmsy-10">-</span>1 all the processes will have a copy of the global vector.<br class="newline" />Scope: <span class="cmbx-10">global </span><br class="newline" />Type: <span class="cmbx-10">optional</span><br class="newline" />Intent: <span class="cmbx-10">in</span>.<br class="newline" />Specified as: an integer variable <span class="cmsy-10">-</span>1 <span class="cmsy-10">≤ </span><span class="cmmi-10">root </span><span class="cmsy-10">≤ </span><span class="cmmi-10">np </span><span class="cmsy-10">- </span>1, default <span class="cmsy-10">-</span>1. </dd><dt class="description"> <span class="cmbx-10">On Return</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">glob</span><span class="cmbx-10">_x</span> </dt><dd class="description">The array where the local parts must be gathered.<br class="newline" />Scope: <span class="cmbx-10">global </span><br class="newline" />Type: <span class="cmbx-10">required</span><br class="newline" />Intent: <span class="cmbx-10">out</span>.<br class="newline" />Specified as: a rank one or two array with the <span class="lstinline"></span><span class="cmtt-10">ALLOCATABLE</span> attribute. </dd><dt class="description"> <span class="cmbx-10">info</span> </dt><dd class="description">Error code.<br class="newline" />Scope: <span class="cmbx-10">local </span><br class="newline" />Type: <span class="cmbx-10">required </span><br class="newline" />Intent: <span class="cmbx-10">out</span>.<br class="newline" />An integer value; 0 means no error has been detected.</dd></dl> <!--l. 451--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu31.html" >next</a>] [<a href="userhtmlsu27.html" >prev</a>] [<a href="userhtmlsu27.html#tailuserhtmlsu27.html" >prev-tail</a>] [<a href="userhtmlsu28.html" >front</a>] [<a href="userhtmlsu28.html#userhtmlsu30.html" >up</a>] </p></div> <!--l. 451--><p class="indent" > <a id="tailuserhtmlsu28.html"></a> </body></html>