<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>psb_spall — Allocates a sparse matrix</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)"> <meta name="originator" content="TeX4ht (http://www.tug.org/tex4ht/)"> <!-- html,3 --> <meta name="src" content="userhtml.tex"> <link rel="stylesheet" type="text/css" href="userhtml.css"> </head><body > <!--l. 547--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu40.html" >next</a>] [<a href="userhtmlsu35.html" >prev</a>] [<a href="userhtmlsu35.html#tailuserhtmlsu35.html" >prev-tail</a>] [<a href="userhtmlsu33.html#tailuserhtmlsu36.html">tail</a>] [<a href="userhtmlsu32.html#userhtmlsu39.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">6.7 </span> <a id="x47-840006.7"></a>psb_spall — Allocates a sparse matrix</h4> <div class="verbatim" id="verbatim-63"> call psb_spall(a, desc_a, info, nnz) </div> <!--l. 551--><p class="nopar" > <!--l. 553--><p class="indent" > <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">desc</span><span class="cmbx-10">_a</span> </dt><dd class="description">the communication descriptor.<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">nnz</span> </dt><dd class="description">An estimate of the number of nonzeroes in the local part of the assembled matrix.<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 value.</dd></dl> <!--l. 569--><p class="indent" > <dl class="description"><dt class="description"> <span class="cmbx-10">On Return</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">a</span> </dt><dd class="description">the matrix to be allocated.<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" />Specified as: a structured data of type <a href="userhtmlsu6.html#spdata"><span class="cmtt-10">psb</span><span class="cmtt-10">_Tspmat</span><span class="cmtt-10">_type</span></a>. </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. 582--><p class="noindent" ><span class="cmbx-12">Notes</span> <ol class="enumerate1" > <li class="enumerate" id="x47-84002x1">On exit from this routine the sparse matrix is in the build state. </li> <li class="enumerate" id="x47-84004x2">The descriptor may be in either the build or assembled state. </li> <li class="enumerate" id="x47-84006x3">Providing a good estimate for the number of nonzeroes <span class="cmmi-10">nnz </span>in the assembled matrix may substantially improve performance in the matrix build phase, as it will reduce or eliminate the need for (potentially multiple) data reallocations.</li></ol> <!--l. 598--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu40.html" >next</a>] [<a href="userhtmlsu35.html" >prev</a>] [<a href="userhtmlsu35.html#tailuserhtmlsu35.html" >prev-tail</a>] [<a href="userhtmlsu36.html" >front</a>] [<a href="userhtmlsu32.html#userhtmlsu39.html" >up</a>] </p></div> <!--l. 598--><p class="indent" > <a id="tailuserhtmlsu36.html"></a> </body></html>