<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 2008 (1.71) original version by: Nikos Drakos, CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>psb_precaply -- Preconditioner application routine</TITLE> <META NAME="description" CONTENT="psb_precaply -- Preconditioner application routine"> <META NAME="keywords" CONTENT="userhtml"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2008"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="userhtml.css"> <LINK REL="next" HREF="node118.html"> <LINK REL="previous" HREF="node116.html"> <LINK REL="up" HREF="node114.html"> <LINK REL="next" HREF="node118.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html1680" HREF="node118.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1676" HREF="node114.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1670" HREF="node116.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1678" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1681" HREF="node118.html">psb_precdescr Prints</A> <B> Up:</B> <A NAME="tex2html1677" HREF="node114.html">Preconditioner routines</A> <B> Previous:</B> <A NAME="tex2html1671" HREF="node116.html">psb_precbld Builds</A> <B> <A NAME="tex2html1679" HREF="node1.html">Contents</A></B> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION000113000000000000000"> psb_precaply -- Preconditioner application routine</A> </H2> <P> <PRE> call psb_precaply(prec,x,y,desc_a,info,trans,work) call psb_precaply(prec,x,desc_a,info,trans) </PRE> <P> <DL> <DT><STRONG>Type:</STRONG></DT> <DD>Synchronous. </DD> <DT><STRONG><B>On Entry</B></STRONG></DT> <DD> </DD> <DT><STRONG>prec</STRONG></DT> <DD>the preconditioner. Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>in</B>. <BR> Specified as: a preconditioner data structure precdata<TT>psb_prec_type</TT>. </DD> <DT><STRONG>x</STRONG></DT> <DD>the source vector. Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>inout</B>. <BR> Specified as: a rank one array or an object of type vdata<TT>psb_T_vect_type</TT>. </DD> <DT><STRONG>desc_a</STRONG></DT> <DD>the problem communication descriptor. Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>in</B>. <BR> Specified as: a communication data structure descdata<TT>psb_desc_type</TT>. </DD> <DT><STRONG>trans</STRONG></DT> <DD>Scope: <BR> Type: <B>optional</B> <BR> Intent: <B>in</B>. <BR> Specified as: a character. </DD> <DT><STRONG>work</STRONG></DT> <DD>an optional work space Scope: <B>local</B> <BR> Type: <B>optional</B> <BR> Intent: <B>inout</B>. <BR> Specified as: a double precision array. </DD> </DL> <P> <DL> <DT><STRONG><B>On Return</B></STRONG></DT> <DD> </DD> <DT><STRONG>y</STRONG></DT> <DD>the destination vector. Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>inout</B>. <BR> Specified as: a rank one array or an object of type vdata<TT>psb_T_vect_type</TT>. </DD> <DT><STRONG>info</STRONG></DT> <DD>Error code. <BR> Scope: <B>local</B> <BR> Type: <B>required</B> <BR> Intent: <B>out</B>. <BR> An integer value; 0 means no error has been detected. </DD> </DL> <P> <BR><HR> </BODY> </HTML>