<!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>Preconditioner routines</TITLE> <META NAME="description" CONTENT="Preconditioner routines"> <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="node104.html"> <LINK REL="previous" HREF="node93.html"> <LINK REL="up" HREF="userhtml.html"> <LINK REL="next" HREF="node100.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html1419" HREF="node100.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html1415" HREF="userhtml.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html1409" HREF="node98.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html1417" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <BR> <B> Next:</B> <A NAME="tex2html1420" HREF="node100.html">psb_precinit Initialize</A> <B> Up:</B> <A NAME="tex2html1416" HREF="userhtml.html">userhtml</A> <B> Previous:</B> <A NAME="tex2html1410" HREF="node98.html">mm_mat_write Write</A> <B> <A NAME="tex2html1418" HREF="node1.html">Contents</A></B> <BR> <BR> <!--End of Navigation Panel--> <H1><A NAME="SECTION000110000000000000000"></A> <A NAME="sec:precs"></A> <BR> Preconditioner routines </H1> <P> <A NAME="sec:psprecs"></A>The base PSBLAS library contains the implementation of two simple preconditioning techniques: <UL> <LI>Diagonal Scaling </LI> <LI>Block Jacobi with ILU(0) factorization </LI> </UL> The supporting data type and subroutine interfaces are defined in the module <code>psb_prec_mod</code>. <P> <BR><HR> <!--Table of Child-Links--> <A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A> <UL> <LI><A NAME="tex2html1421" HREF="node100.html">psb_precinit -- Initialize a preconditioner</A> <LI><A NAME="tex2html1422" HREF="node101.html">psb_precbld -- Builds a preconditioner</A> <LI><A NAME="tex2html1423" HREF="node102.html">psb_precaply -- Preconditioner application routine</A> <LI><A NAME="tex2html1424" HREF="node103.html">psb_precdescr -- Prints a description of current preconditioner</A> </UL> <!--End of Table of Child-Links--> <BR><HR> </BODY> </HTML>