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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<TITLE>Preconditioner routines</TITLE>
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<TITLE>mm_mat_write -- Write a sparse matrix to a file in the MatrixMarket format</TITLE>
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<H1><A NAME="SECTION000110000000000000000"></A>
<A NAME="sec:precs"></A>
<H2><A NAME="SECTION000105000000000000000">
mm_mat_write -- Write a sparse matrix to a
file in the MatrixMarket format</A>
</H2>
<P>
<BR>
Preconditioner routines
</H1>
<IMG
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ALT="\begin{lstlisting}
call mm_mat_write(a, mtitle, iret, iunit, filename)
\end{lstlisting}">
<BR>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>a</STRONG></DT>
<DD>the sparse matrix to be written.
<BR>
Type:<B>required</B>.
<BR>
Specified as: a structured data of type spdata<TT>psb_Tspmat_type</TT>.
</DD>
<DT><STRONG>mtitle</STRONG></DT>
<DD>Matrix title.
<BR>
Type: <B>required</B>
<BR>
A charachter variable holding a descriptive title for the matrix to be
written to file.
</DD>
<DT><STRONG>filename</STRONG></DT>
<DD>The name of the file to be written to.
<BR>
Type:<B>optional</B>.
<BR>
Specified as: a character variable containing a valid file name, or
<code>-</code>, in which case the default output unit 6 (i.e. standard output
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>
<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>.
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</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>
<P>
<BR><HR>
<!--Table of Child-Links-->
<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
<UL>
<LI><A NAME="tex2html1760"
HREF="node122.html">psb_precinit -- Initialize a preconditioner</A>
<LI><A NAME="tex2html1761"
HREF="node123.html">psb_precbld -- Builds a preconditioner</A>
<LI><A NAME="tex2html1762"
HREF="node124.html">psb_precaply -- Preconditioner application
routine</A>
<LI><A NAME="tex2html1763"
HREF="node125.html">psb_precdescr -- Prints a description of current
preconditioner</A>
<LI><A NAME="tex2html1764"
HREF="node126.html">clone -- clone current
preconditioner</A>
</UL>
<!--End of Table of Child-Links-->
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