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psblas3:
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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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<HTML>
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<HEAD>
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<TITLE>Preconditioner routines</TITLE>
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<META NAME="description" CONTENT="Preconditioner routines">
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<TITLE>mm_mat_write -- Write a sparse matrix to a file in the MatrixMarket format</TITLE>
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<META NAME="description" CONTENT="mm_mat_write -- Write a sparse matrix to a file in the MatrixMarket format">
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@@ -18,76 +18,102 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<BR>
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<B> Next:</B> <A NAME="tex2html1601"
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HREF="node112.html">psb_precinit Initialize</A>
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1591"
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HREF="node110.html">mm_mat_write Write</A>
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<B> <A NAME="tex2html1599"
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<B> Next:</B> <A NAME="tex2html1602"
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HREF="node112.html">Preconditioner routines</A>
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<B> Up:</B> <A NAME="tex2html1598"
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HREF="node106.html">Utilities</A>
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<B> Previous:</B> <A NAME="tex2html1594"
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HREF="node110.html">mm_vet_read Read</A>
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<B> <A NAME="tex2html1600"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H1><A NAME="SECTION000110000000000000000"></A>
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<A NAME="sec:precs"></A>
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<H2><A NAME="SECTION000105000000000000000">
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mm_mat_write -- Write a sparse matrix to a
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file in the MatrixMarket format</A>
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</H2>
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<PRE>
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call mm_mat_write(a, mtitle, iret, iunit, filename)
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</PRE>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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</DD>
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<DT><STRONG><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>a</STRONG></DT>
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<DD>the sparse matrix to be written.
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<BR>
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Preconditioner routines
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</H1>
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Type:<B>required</B>.
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<BR>
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Specified as: a structured data of type spdata<TT>psb_Tspmat_type</TT>.
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</DD>
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<DT><STRONG>mtitle</STRONG></DT>
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<DD>Matrix title.
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<BR>
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Type: <B>required</B>
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<BR>
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A charachter variable holding a descriptive title for the matrix to be
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written to file.
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</DD>
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<DT><STRONG>filename</STRONG></DT>
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<DD>The name of the file to be written to.
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<BR>
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Type:<B>optional</B>.
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<BR>
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Specified as: a character variable containing a valid file name, or
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<code>-</code>, in which case the default output unit 6 (i.e. standard output
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in Unix jargon) is used. Default: <code>-</code>.
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</DD>
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<DT><STRONG>iunit</STRONG></DT>
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<DD>The Fortran file unit number.
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<BR>
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Type:<B>optional</B>.
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<BR>
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Specified as: an integer value. Only meaningful if filename is not <code>-</code>.
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</DD>
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</DL>
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<P>
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<A NAME="sec:psprecs"></A>The base PSBLAS library contains the implementation of two simple
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preconditioning techniques:
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<UL>
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<LI>Diagonal Scaling
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</LI>
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<LI>Block Jacobi with ILU(0) factorization
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</LI>
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</UL>
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The supporting data type and subroutine interfaces are defined in the
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module <code>psb_prec_mod</code>.
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>iret</STRONG></DT>
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<DD>Error code.
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<BR>
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Type: <B>required</B>
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<BR>
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An integer value; 0 means no error has been detected.
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</DD>
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</DL>
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<P>
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<BR><HR>
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<!--Table of Child-Links-->
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<A NAME="CHILD_LINKS"><STRONG>Subsections</STRONG></A>
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<UL>
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<LI><A NAME="tex2html1602"
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HREF="node112.html">psb_precinit -- Initialize a preconditioner</A>
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<LI><A NAME="tex2html1603"
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HREF="node113.html">psb_precbld -- Builds a preconditioner</A>
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<LI><A NAME="tex2html1604"
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HREF="node114.html">psb_precaply -- Preconditioner application routine</A>
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<LI><A NAME="tex2html1605"
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HREF="node115.html">psb_precdescr -- Prints a description of current
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preconditioner</A>
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</UL>
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