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209 lines
8.8 KiB
HTML
209 lines
8.8 KiB
HTML
5 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html >
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<head><title>psb_gedots — Generalized Dot Product</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="generator" content="TeX4ht (http://www.tug.org/tex4ht/)">
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<meta name="originator" content="TeX4ht (http://www.tug.org/tex4ht/)">
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<!-- html,3 -->
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<meta name="src" content="userhtml.tex">
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<link rel="stylesheet" type="text/css" href="userhtml.css">
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</head><body
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>
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<!--l. 230--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlsu16.html" >next</a>] [<a
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href="userhtmlsu11.html" >prev</a>] [<a
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href="userhtmlsu11.html#tailuserhtmlsu11.html" >prev-tail</a>] [<a
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href="userhtmlse4.html#tailuserhtmlsu12.html">tail</a>] [<a
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href="userhtmlsu12.html#userhtmlsu15.html" >up</a>] </p></div>
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<h4 class="subsectionHead"><span class="titlemark">4.3 </span> <a
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id="x21-580004.3"></a>psb_gedots — Generalized Dot Product</h4>
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<!--l. 232--><p class="noindent" >This subroutine computes a series of dot products among the columns of two dense
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matrices <span
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class="cmmi-10">x </span>and <span
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class="cmmi-10">y</span>:
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<center class="math-display" >
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<img
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src="userhtml4x.png" alt=" T
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res(i) ← x(:,i) y(:,i)
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" class="math-display" ></center>
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<!--l. 234--><p class="nopar" > If the matrices are complex, then the usual convention applies, i.e. the conjugate
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transpose of <span
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class="cmmi-10">x </span>is used. If <span
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class="cmmi-10">x </span>and <span
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class="cmmi-10">y </span>are of rank one, then <span
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class="cmmi-10">res </span>is a scalar, else it is a rank
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one array.
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<div class="verbatim" id="verbatim-42">
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call psb_gedots(res, x, y, desc_a, info)
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</div>
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<!--l. 242--><p class="nopar" > <div class="table">
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<!--l. 243--><p class="indent" > <a
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id="x21-580013"></a><hr class="float"><div class="float"
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>
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<div class="center"
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>
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<!--l. 244--><p class="noindent" >
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<div class="tabular"> <table id="TBL-3" class="tabular"
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cellspacing="0" cellpadding="0"
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><colgroup id="TBL-3-1g"><col
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id="TBL-3-1"><col
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id="TBL-3-2"></colgroup><tr
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class="hline"><td><hr></td><td><hr></td></tr><tr
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style="vertical-align:baseline;" id="TBL-3-1-"><td style="white-space:nowrap; text-align:left;" id="TBL-3-1-1"
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class="td11"><span
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class="cmmi-10">res</span>, <span
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class="cmmi-10">x</span>, <span
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class="cmmi-10">y </span></td><td style="white-space:nowrap; text-align:left;" id="TBL-3-1-2"
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class="td11"><span
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class="cmbx-10">Subroutine</span></td>
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</tr><tr
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class="hline"><td><hr></td><td><hr></td></tr><tr
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style="vertical-align:baseline;" id="TBL-3-2-"><td style="white-space:nowrap; text-align:left;" id="TBL-3-2-1"
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class="td11">Short Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-3-2-2"
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class="td11">psb_gedots </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-3-3-"><td style="white-space:nowrap; text-align:left;" id="TBL-3-3-1"
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class="td11">Long Precision Real </td><td style="white-space:nowrap; text-align:left;" id="TBL-3-3-2"
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class="td11">psb_gedots </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-3-4-"><td style="white-space:nowrap; text-align:left;" id="TBL-3-4-1"
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class="td11">Short Precision Complex</td><td style="white-space:nowrap; text-align:left;" id="TBL-3-4-2"
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class="td11">psb_gedots </td>
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</tr><tr
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style="vertical-align:baseline;" id="TBL-3-5-"><td style="white-space:nowrap; text-align:left;" id="TBL-3-5-1"
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class="td11">Long Precision Complex </td><td style="white-space:nowrap; text-align:left;" id="TBL-3-5-2"
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class="td11">psb_gedots </td>
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</tr><tr
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class="hline"><td><hr></td><td><hr></td></tr><tr
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style="vertical-align:baseline;" id="TBL-3-6-"><td style="white-space:nowrap; text-align:left;" id="TBL-3-6-1"
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class="td11"> </td></tr></table></div></div>
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<br /> <div class="caption"
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><span class="id">Table 3: </span><span
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class="content">Data types</span></div><!--tex4ht:label?: x21-580013 -->
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</div><hr class="endfloat" />
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</div>
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">Type:</span> </dt><dd
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class="description">Synchronous.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Entry</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">x</span> </dt><dd
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class="description">the local portion of global dense matrix <span
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class="cmmi-10">x</span>. <br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required </span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: a rank one or two array or an object of type
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<a
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href="userhtmlsu7.html#vdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_vect</span><span
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class="cmtt-10">_type</span></a> containing numbers of type specified in Table <a
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href="#x21-580013">3<!--tex4ht:ref: tab:f90mdot --></a>. The
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rank of <span
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class="cmmi-10">x </span>must be the same of <span
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class="cmmi-10">y</span>.
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</dd><dt class="description">
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<span
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class="cmbx-10">y</span> </dt><dd
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class="description">the local portion of global dense matrix <span
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class="cmmi-10">y</span>. <br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required </span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: a rank one or two array or an object of type
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<a
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href="userhtmlsu7.html#vdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_T</span><span
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class="cmtt-10">_vect</span><span
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class="cmtt-10">_type</span></a> containing numbers of type specified in Table <a
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href="#x21-580013">3<!--tex4ht:ref: tab:f90mdot --></a>. The
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rank of <span
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class="cmmi-10">y </span>must be the same of <span
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class="cmmi-10">x</span>.
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</dd><dt class="description">
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<span
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class="cmbx-10">desc</span><span
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class="cmbx-10">_a</span> </dt><dd
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class="description">contains data structures for communications.<br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required</span><br
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class="newline" />Intent: <span
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class="cmbx-10">in</span>.<br
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class="newline" />Specified as: an object of type <a
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href="userhtmlsu5.html#descdata"><span
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class="cmtt-10">psb</span><span
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class="cmtt-10">_desc</span><span
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class="cmtt-10">_type</span></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">On Return</span> </dt><dd
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class="description">
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</dd><dt class="description">
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<span
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class="cmbx-10">res</span> </dt><dd
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class="description">is the dot product of vectors <span
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class="cmmi-10">x </span>and <span
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class="cmmi-10">y</span>.<br
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class="newline" />Scope: <span
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class="cmbx-10">global </span><br
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class="newline" />Intent: <span
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class="cmbx-10">out</span>.<br
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class="newline" />Specified as: a number or a rank-one array of the data type indicated in
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Table <a
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href="userhtmlsu11.html#x20-570012">2<!--tex4ht:ref: tab:f90dot --></a>.
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</dd><dt class="description">
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<span
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class="cmbx-10">info</span> </dt><dd
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class="description">Error code.<br
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class="newline" />Scope: <span
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class="cmbx-10">local </span><br
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class="newline" />Type: <span
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class="cmbx-10">required </span><br
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class="newline" />Intent: <span
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class="cmbx-10">out</span>.<br
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class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
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<!--l. 303--><div class="crosslinks"><p class="noindent">[<a
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href="userhtmlsu16.html" >next</a>] [<a
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href="userhtmlsu11.html" >prev</a>] [<a
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href="userhtmlsu11.html#tailuserhtmlsu11.html" >prev-tail</a>] [<a
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href="userhtmlsu12.html" >front</a>] [<a
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href="userhtmlsu12.html#userhtmlsu15.html" >up</a>] </p></div>
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<!--l. 303--><p class="indent" > <a
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id="tailuserhtmlsu12.html"></a>
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</body></html>
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