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<TITLE>psb_precbld -- Builds a preconditioner</TITLE>
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<TITLE>Preconditioner routines</TITLE>
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<H2><A NAME="SECTION000112000000000000000">
psb_precbld -- Builds a preconditioner</A>
</H2>
<H1><A NAME="SECTION000110000000000000000"></A>
<A NAME="sec:precs"></A>
<BR>
Preconditioner routines
</H1>
<P>
<PRE>
call psb_precbld(a, desc_a, prec, info,amold,vmold)
</PRE>
<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>.
<P>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Synchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>a</STRONG></DT>
<DD>the system sparse matrix.
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>in</B>, target.
<BR>
Specified as: a sparse matrix data structure spdata<TT>psb_Tspmat_type</TT>.
</DD>
<DT><STRONG>prec</STRONG></DT>
<DD>the preconditioner.
<BR>
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>inout</B>.
<BR>
Specified as: an already initialized precondtioner data structure precdata<TT>psb_prec_type</TT>
<BR></DD>
<DT><STRONG>desc_a</STRONG></DT>
<DD>the problem communication descriptor.
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>in</B>, target.
<BR>
Specified as: a communication descriptor data structure descdata<TT>psb_desc_type</TT>.
</DD>
<DT><STRONG>amold</STRONG></DT>
<DD>The desired dynamic type for the internal matrix storage.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an object of a class derived from spbasedata<TT>psb_T_base_sparse_mat</TT>.
</DD>
<DT><STRONG>vmold</STRONG></DT>
<DD>The desired dynamic type for the internal vector storage.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an object of a class derived from vbasedata<TT>psb_T_base_vect_type</TT>.
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<P>
</DD>
</DL>
<P>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>prec</STRONG></DT>
<DD>the preconditioner.
<BR>
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>inout</B>.
<BR>
Specified as: a precondtioner data structure precdata<TT>psb_prec_type</TT>
<BR></DD>
<DT><STRONG>info</STRONG></DT>
<DD>Error code.
<BR>
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>out</B>.
<BR>
An integer value; 0 means no error has been detected.
</DD>
</DL>
<P>
<UL>
<LI><A NAME="tex2html1790"
HREF="node124.html">psb_precinit -- Initialize a preconditioner</A>
<LI><A NAME="tex2html1791"
HREF="node125.html">psb_precbld -- Builds a preconditioner</A>
<LI><A NAME="tex2html1792"
HREF="node126.html">psb_precaply -- Preconditioner application
routine</A>
<LI><A NAME="tex2html1793"
HREF="node127.html">psb_precdescr -- Prints a description of current
preconditioner</A>
<LI><A NAME="tex2html1794"
HREF="node128.html">clone -- clone current
preconditioner</A>
</UL>
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