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<TITLE>Preconditioner routines</TITLE>
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<H1><A NAME="SECTION000110000000000000000"></A>
<A NAME="sec:precs"></A>
<H2><A NAME="SECTION000104000000000000000">
mm_array_read -- Read a dense array from a
file in the MatrixMarket format</A>
</H2>
<P>
<BR>
<IMG
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ALT="\begin{lstlisting}
call mm_array_read(b, iret, iunit, filename)
\end{lstlisting}">
<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
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>filename</STRONG></DT>
<DD>The name of the file to be read.
<BR>
Type:<B>optional</B>.
<BR>
Specified as: a character variable containing a valid file name, or
<code>-</code>, in which case the default input unit 5 (i.e. standard input
in Unix jargon) is used. Default: <code>-</code>.
</DD>
<DT><STRONG>iunit</STRONG></DT>
<DD>The Fortran file unit number.
<BR>
Type:<B>optional</B>.
<BR>
Specified as: an integer value. Only meaningful if filename is not <code>-</code>.
</DD>
</DL>
<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>b</STRONG></DT>
<DD>Rigth hand side(s).
<BR>
Type: <B>required</B>
<BR>
An array of type real or complex, rank 1 or 2 and having the ALLOCATABLE
attribute; will be allocated and filled in if the input file contains
a right hand side, otherwise will be left in the UNALLOCATED state.
</DD>
<DT><STRONG>iret</STRONG></DT>
<DD>Error code.
<BR>
Type: <B>required</B>
<BR>
An integer value; 0 means no error has been detected.
</DD>
</DL>
<UL CLASS="ChildLinks">
<LI><A NAME="tex2html1821"
HREF="node126.html">init -- Initialize a preconditioner</A>
<LI><A NAME="tex2html1822"
HREF="node127.html">build -- Builds a preconditioner</A>
<LI><A NAME="tex2html1823"
HREF="node128.html">apply -- Preconditioner application
routine</A>
<LI><A NAME="tex2html1824"
HREF="node129.html">descr -- Prints a description of current
preconditioner</A>
<LI><A NAME="tex2html1825"
HREF="node130.html">clone -- clone current
preconditioner</A>
<LI><A NAME="tex2html1826"
HREF="node131.html">free -- Free a preconditioner</A>
</UL>
<!--End of Table of Child-Links-->
<P>
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