<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html > <head><title>apply — Preconditioner application routine</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. 153--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu90.html" >next</a>] [<a href="userhtmlsu85.html" >prev</a>] [<a href="userhtmlsu85.html#tailuserhtmlsu85.html" >prev-tail</a>] [<a href="userhtmlse10.html#tailuserhtmlsu86.html">tail</a>] [<a href="userhtmlsu86.html#userhtmlse11.html" >up</a>] </p></div> <h4 class="subsectionHead"><span class="titlemark">10.3 </span> <a id="x102-13800010.3"></a>apply — Preconditioner application routine</h4> <pre class="verbatim" id="verbatim-81"> call prec%apply(x,y,desc_a,info,trans,work) call prec%apply(x,desc_a,info,trans) </pre> <!--l. 158--><p class="nopar" > <!--l. 160--><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">prec</span> </dt><dd class="description">the preconditioner. 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 preconditioner data structure <a href="userhtmlsu8.html#precdata"><span class="cmtt-10">psb</span><span class="cmtt-10">_prec</span><span class="cmtt-10">_type</span></a>. </dd><dt class="description"> <span class="cmbx-10">x</span> </dt><dd class="description">the source vector. 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 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>. </dd><dt class="description"> <span class="cmbx-10">desc</span><span class="cmbx-10">_a</span> </dt><dd class="description">the problem communication descriptor. 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 communication data structure <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">trans</span> </dt><dd class="description">Scope: <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: a character. </dd><dt class="description"> <span class="cmbx-10">work</span> </dt><dd class="description">an optional work space Scope: <span class="cmbx-10">local </span><br class="newline" />Type: <span class="cmbx-10">optional</span><br class="newline" />Intent: <span class="cmbx-10">inout</span>.<br class="newline" />Specified as: a double precision array.</dd></dl> <!--l. 190--><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">y</span> </dt><dd class="description">the destination vector. 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 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>. </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. 206--><div class="crosslinks"><p class="noindent">[<a href="userhtmlsu90.html" >next</a>] [<a href="userhtmlsu85.html" >prev</a>] [<a href="userhtmlsu85.html#tailuserhtmlsu85.html" >prev-tail</a>] [<a href="userhtmlsu86.html" >front</a>] [<a href="userhtmlsu86.html#userhtmlse11.html" >up</a>] </p></div> <!--l. 206--><p class="indent" > <a id="tailuserhtmlsu86.html"></a> </body></html>