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Use it in GENPDE. Update docs
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Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>Computational routines</TITLE>
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<TITLE>Preconditioner data structure</TITLE>
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@@ -18,78 +18,72 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<B> Next:</B> <A NAME="tex2html808"
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HREF="node48.html">psb_geaxpby General</A>
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<H1><A NAME="SECTION00050000000000000000">
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Computational routines</A>
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<H2><A NAME="SECTION00044000000000000000"></A>
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<A NAME="sec:prec"></A>
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<BR>
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Preconditioner data structure
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</H2>
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Our base library offers support for simple well known preconditioners
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like Diagonal Scaling or Block Jacobi with incomplete
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factorization ILU(0).
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<P>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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A preconditioner is held in the precdata<TT> psb_prec_type</TT> data structure reported in
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figure <A HREF="#fig:prectype">6</A>. The <code>psb_prec_type</code>
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data type may contain a simple preconditioning matrix with the
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associated communication descriptor.The internal preconditioner is allocated appropriately with the
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dynamic type corresponding to the desired preconditioner.
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<UL>
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<LI><A NAME="tex2html809"
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HREF="node48.html">psb_geaxpby -- General Dense Matrix Sum</A>
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HREF="node49.html">psb_gedot -- Dot Product</A>
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HREF="node50.html">psb_gedots -- Generalized Dot Product</A>
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<LI><A NAME="tex2html812"
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HREF="node51.html">psb_normi -- Infinity-Norm of Vector</A>
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HREF="node52.html">psb_geamaxs -- Generalized Infinity Norm</A>
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<LI><A NAME="tex2html814"
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HREF="node53.html">psb_norm1 -- 1-Norm of Vector</A>
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HREF="node54.html">psb_geasums -- Generalized 1-Norm of Vector</A>
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HREF="node55.html">psb_norm2 -- 2-Norm of Vector</A>
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HREF="node56.html">psb_genrm2s -- Generalized 2-Norm of Vector</A>
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<LI><A NAME="tex2html818"
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HREF="node57.html">psb_norm1 -- 1-Norm of Sparse Matrix</A>
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HREF="node58.html">psb_normi -- Infinity Norm of Sparse Matrix</A>
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<LI><A NAME="tex2html820"
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HREF="node59.html">psb_spmm -- Sparse Matrix by Dense Matrix
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Product</A>
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<LI><A NAME="tex2html821"
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HREF="node60.html">psb_spsm -- Triangular System Solve</A>
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<DIV ALIGN="CENTER"><A NAME="fig:prectype"></A><A NAME="880"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 6:</STRONG>
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The PSBLAS defined data type that contains a preconditioner.</CAPTION>
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<TR><TD><FONT SIZE="-1"> </FONT>
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<DIV ALIGN="CENTER"></DIV><TABLE WIDTH="90%">
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<TR><TD>
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<PRE>
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type psb_Tprec_type
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class(psb_T_base_prec_type), allocatable :: prec
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end type psb_Tprec_type
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</PRE></TD></TR>
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</TABLE>
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