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<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>.
The old interfaces <code>psb_precinit</code> and <code>psb_precbld</code> are still supported for
backward compatibility
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<LI><A NAME="tex2html1866"
HREF="node129.html">init -- Initialize a preconditioner</A>
<LI><A NAME="tex2html1867"
HREF="node130.html">build -- Builds a preconditioner</A>
<LI><A NAME="tex2html1868"
HREF="node131.html">apply -- Preconditioner application
routine</A>
<LI><A NAME="tex2html1869"
HREF="node132.html">descr -- Prints a description of current
preconditioner</A>
<LI><A NAME="tex2html1870"
HREF="node133.html">clone -- clone current
preconditioner</A>
<LI><A NAME="tex2html1871"
HREF="node134.html">free -- Free a preconditioner</A>
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