<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>psb_geaxpby — General Dense Matrix Sum</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. 8--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu14.html" >next</a>] [<a href="userhtmlsu8.html#tailuserhtmlsu10.html">tail</a>] [<a href="userhtmlsu12.html#userhtmlsu13.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">4.1 </span> <a id="x19-560004.1"></a>psb_geaxpby — General Dense Matrix Sum</h4> <!--l. 10--><p class="noindent" >This subroutine is an interface to the computational kernel for dense matrix sum: <center class="math-display" > <img src="userhtml1x.png" alt="y ← α x+ βy " class="math-display" ></center> <!--l. 12--><p class="nopar" > <!--l. 19--><p class="indent" > <span class="lstinline"></span><span class="cmtt-10">call</span><span class="cmtt-10"> </span><span class="cmtt-10">psb_geaxpby</span><span class="cmtt-10">(</span><span class="cmtt-10">alpha</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">x</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">beta</span><span class="cmtt-10">,</span><span class="cmtt-10"> </span><span class="cmtt-10">y</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> <div class="table"> <!--l. 23--><p class="indent" > <a id="x19-56001r1"></a><hr class="float"><div class="float" > <div class="center" > <!--l. 24--><p class="noindent" > <div class="tabular"> <table id="TBL-1" class="tabular" cellspacing="0" cellpadding="0" ><colgroup id="TBL-1-1g"><col id="TBL-1-1"><col id="TBL-1-2"></colgroup><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-1-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-1-1-1" class="td11"><span class="cmmi-10">x</span>, <span class="cmmi-10">y</span>, <span class="cmmi-10">α</span>, <span class="cmmi-10">β </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-1-1-2" 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-1-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-1-2-1" class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-1-2-2" class="td11">psb_geaxpby</td> </tr><tr style="vertical-align:baseline;" id="TBL-1-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-1-3-1" class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-1-3-2" class="td11">psb_geaxpby</td> </tr><tr style="vertical-align:baseline;" id="TBL-1-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-1-4-1" class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-1-4-2" class="td11">psb_geaxpby</td> </tr><tr style="vertical-align:baseline;" id="TBL-1-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-1-5-1" class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-1-5-2" class="td11">psb_geaxpby</td> </tr><tr class="hline"><td><hr></td><td><hr></td></tr><tr style="vertical-align:baseline;" id="TBL-1-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-1-6-1" class="td11"> </td></tr></table></div></div> <br /> <div class="caption" ><span class="id">Table 1: </span><span class="content">Data types</span></div><!--tex4ht:label?: x19-56001r1 --> </div><hr class="endfloat" /> </div> <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">alpha</span> </dt><dd class="description">the scalar <span class="cmmi-10">α</span>.<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">in</span>.<br class="newline" />Specified as: a number of the data type indicated in Table <a href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>. </dd><dt class="description"> <span class="cmbx-10">x</span> </dt><dd class="description">the local portion of global dense matrix <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> containing numbers of type specified in Table <a href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>. The rank of <span class="cmmi-10">x </span>must be the same of <span class="cmmi-10">y</span>. </dd><dt class="description"> <span class="cmbx-10">beta</span> </dt><dd class="description">the scalar <span class="cmmi-10">β</span>.<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">in</span>.<br class="newline" />Specified as: a number of the data type indicated in Table <a href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>. </dd><dt class="description"> <span class="cmbx-10">y</span> </dt><dd class="description">the local portion of the global dense matrix <span class="cmmi-10">y</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">inout</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> containing numbers of the type indicated in Table <a href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></a>. The rank of <span class="cmmi-10">y </span>must be the same of <span class="cmmi-10">x</span>. </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></dl> <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">y</span> </dt><dd class="description">the local portion of result submatrix <span class="cmmi-10">y</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">inout</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> containing numbers of the type indicated in Table <a href="#x19-56001r1">1<!--tex4ht:ref: tab:f90axpby --></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. 111--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu14.html" >next</a>] [<a href="userhtmlsu10.html" >front</a>] [<a href="userhtmlsu12.html#userhtmlsu13.html" >up</a>] </p></div> <!--l. 111--><p class="indent" > <a id="tailuserhtmlsu10.html"></a> </body></html>