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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<TITLE>Computational routines</TITLE>
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<TITLE>Preconditioner data structure</TITLE>
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<H1><A NAME="SECTION00050000000000000000">
Computational routines</A>
</H1>
<H2><A NAME="SECTION00044000000000000000"></A>
<A NAME="sec:prec"></A>
<BR>
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>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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 internal preconditioner is allocated appropriately with the
dynamic type corresponding to the desired preconditioner.
<UL>
<LI><A NAME="tex2html840"
HREF="node50.html">psb_geaxpby -- General Dense Matrix Sum</A>
<LI><A NAME="tex2html841"
HREF="node51.html">psb_gedot -- Dot Product</A>
<LI><A NAME="tex2html842"
HREF="node52.html">psb_gedots -- Generalized Dot Product</A>
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HREF="node53.html">psb_normi -- Infinity-Norm of Vector</A>
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HREF="node54.html">psb_geamaxs -- Generalized Infinity Norm</A>
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<LI><A NAME="tex2html849"
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Product</A>
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<DIV ALIGN="CENTER"><A NAME="fig:prectype"></A><A NAME="920"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6:</STRONG>
The PSBLAS defined data type that contains a preconditioner.</CAPTION>
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</FONT>
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<PRE>
type psb_Tprec_type
class(psb_T_base_prec_type), allocatable :: prec
end type psb_Tprec_type
</PRE></TD></TR>
</TABLE>
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