<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>psb_normi — Infinity Norm of Sparse 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. 866--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu24.html" >next</a>] [<a href="userhtmlsu19.html" >prev</a>] [<a href="userhtmlsu19.html#tailuserhtmlsu19.html" >prev-tail</a>] [<a href="userhtmlsu17.html#tailuserhtmlsu20.html">tail</a>] [<a href="userhtmlsu12.html#userhtmlsu23.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">4.11 </span> <a id="x29-660004.11"></a>psb_normi — Infinity Norm of Sparse Matrix</h4> <!--l. 868--><p class="noindent" >This function computes the infinity-norm of a matrix <span class="cmmi-10">A</span>:<br class="newline" /> <center class="par-math-display" > <img src="userhtml17x.png" alt="nrmi ← ∥A∥∞ " class="par-math-display" ></center> <!--l. 870--><p class="nopar" > where: <dl class="description"><dt class="description"> <span class="cmmi-10">A</span> </dt><dd class="description">represents the global matrix <span class="cmmi-10">A</span></dd></dl> <div class="table"> <!--l. 876--><p class="indent" > <a id="x29-66001r11"></a><hr class="float"><div class="float" > <div class="center" > <!--l. 877--><p class="noindent" > <div class="tabular"> <table id="TBL-11" class="tabular" cellspacing="0" cellpadding="0" ><colgroup id="TBL-11-1g"><col id="TBL-11-1"><col id="TBL-11-2"></colgroup><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-11-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-1-1" class="td11"><span class="cmmi-10">A </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-11-1-2" class="td11"><span class="cmbx-10">Function </span></td></tr><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-11-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-2-1" class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-11-2-2" class="td11">psb_spnrmi</td> </tr><tr style="vertical-align:baseline;" id="TBL-11-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-3-1" class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-11-3-2" class="td11">psb_spnrmi</td> </tr><tr style="vertical-align:baseline;" id="TBL-11-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-4-1" class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-11-4-2" class="td11">psb_spnrmi</td> </tr><tr style="vertical-align:baseline;" id="TBL-11-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-5-1" class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-11-5-2" class="td11">psb_spnrmi</td> </tr><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-11-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-11-6-1" class="td11"> </td></tr></table></div></div> <br /> <div class="caption" ><span class="id">Table 11: </span><span class="content">Data types</span></div><!--tex4ht:label?: x29-66001r11 --> </div><hr class="endfloat" /> </div> <pre class="verbatim" id="verbatim-32"> psb_spnrmi(A, desc_a, info) psb_normi(A, desc_a, info) </pre> <!--l. 895--><p class="nopar" > <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">a</span> </dt><dd class="description">the local portion of the global sparse matrix <span class="cmmi-10">A</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: an object 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">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: an object 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">On Return</span> </dt><dd class="description"> </dd><dt class="description"> <span class="cmbx-10">Function value</span> </dt><dd class="description">is the infinity-norm of sparse submatrix <span class="cmmi-10">A</span>.<br class="newline" />Scope: <span class="cmbx-10">global </span><br class="newline" />Specified as: a long precision real number. </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. 930--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu24.html" >next</a>] [<a href="userhtmlsu19.html" >prev</a>] [<a href="userhtmlsu19.html#tailuserhtmlsu19.html" >prev-tail</a>] [<a href="userhtmlsu20.html" >front</a>] [<a href="userhtmlsu12.html#userhtmlsu23.html" >up</a>] </p></div> <!--l. 930--><p class="indent" > <a id="tailuserhtmlsu20.html"></a> </body></html>