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Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>Preconditioner data structure</TITLE>
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<TITLE>Data structure query routines</TITLE>
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<H2><A NAME="SECTION00044000000000000000"></A>
<A NAME="sec:prec"></A>
<H2><A NAME="SECTION00045000000000000000"></A>
<A NAME="sec:dataquery"></A>
<BR>
Preconditioner data structure
Data structure query routines
</H2>
Our base library offers support for simple well known preconditioners
like Diagonal Scaling or Block Jacobi with incomplete
factorization ILU(0).
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<P>
A preconditioner is held in the precdata<TT> psb_prec_type</TT> data structure reported in
figure&nbsp;<A HREF="#fig:prectype">6</A>. The <code>psb_prec_type</code>
data type may contain a simple preconditioning matrix with the
associated communication descriptor.The values contained in
the <code>iprcparm</code> and <code>rprcparm</code> define tha type of
preconditioner along with all the parameters related to it; thus,
<code>iprcparm</code> and <code>rprcparm</code> define how the other records have
to be interpreted. This data structure is the basis of more complex
preconditioning strategies, which are the subject of further
research.
<DIV ALIGN="CENTER"><A NAME="fig:prectype"></A><A NAME="680"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6:</STRONG>
The PSBLAS defined data type that contains a preconditioner.</CAPTION>
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<LI><A NAME="tex2html357"
HREF="node16.html">get_local_rows -- Get number of local rows</A>
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HREF="node17.html">get_local_cols -- Get number of local cols</A>
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HREF="node18.html">get_global_rows -- Get number of global rows</A>
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HREF="node19.html">get_global_cols -- Get number of global cols</A>
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