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Documentation changes. We have barely begun.....
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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>Named Constants</TITLE>
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<TITLE>Preconditioner data structure</TITLE>
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<H3><A NAME="SECTION00043100000000000000"></A>
<A NAME="sec:sp_constants"></A>
<H2><A NAME="SECTION00044000000000000000"></A>
<A NAME="sec:prec"></A>
<BR>
Named Constants
</H3>
<DL>
<DT><STRONG>psb_dupl_ovwrt_</STRONG></DT>
<DD>Duplicate coefficients should be overwritten
(i.e. ignore duplications)
</DD>
<DT><STRONG>psb_dupl_add_</STRONG></DT>
<DD>Duplicate coefficients should be added;
</DD>
<DT><STRONG>psb_dupl_err_</STRONG></DT>
<DD>Duplicate coefficients should trigger an error conditino
</DD>
<DT><STRONG>psb_upd_dflt_</STRONG></DT>
<DD>Default update strategy for matrix coefficients;
</DD>
<DT><STRONG>psb_upd_srch_</STRONG></DT>
<DD>Update strategy based on search into the data structure;
</DD>
<DT><STRONG>psb_upd_perm_</STRONG></DT>
<DD>Update strategy based on additional
permutation data (see tools routine description).
</DD>
</DL>
Preconditioner data structure
</H2>
Our base library offers support for simple well known preconditioners
like Diagonal Scaling or Block Jacobi with incomplete
factorization ILU(0).
<P>
A preconditioner is held in the precdata<TT> psb_prec_type</TT> data structure reported in
figure&nbsp;<A HREF="#fig:prectype">5</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="642"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 5:</STRONG>
The PSBLAS defined data type that contains a preconditioner.</CAPTION>
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