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Salvatore Filippone
+103
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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>psb_precinit -- Initialize a preconditioner</TITLE>
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<META NAME="description" CONTENT="psb_precinit -- Initialize a preconditioner">
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<TITLE>hb_write -- Write a sparse matrix to a file in the Harwell-Boeing format</TITLE>
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<META NAME="description" CONTENT="hb_write -- Write a sparse matrix to a file in the Harwell-Boeing format">
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<META NAME="keywords" CONTENT="userhtml">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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@@ -20,123 +20,151 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<LINK REL="next" HREF="node115.html">
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<LINK REL="previous" HREF="node113.html">
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<LINK REL="up" HREF="node113.html">
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<LINK REL="up" HREF="node112.html">
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<LINK REL="next" HREF="node115.html">
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</HEAD>
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<BODY >
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<!--Navigation Panel-->
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<A NAME="tex2html1662"
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<A NAME="tex2html1669"
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HREF="node115.html">
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<A NAME="tex2html1665"
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HREF="node112.html">
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<A NAME="tex2html1652"
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HREF="node113.html">
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<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A>
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<A NAME="tex2html1660"
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html1663"
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HREF="node115.html">psb_precbld Builds</A>
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<B> Up:</B> <A NAME="tex2html1659"
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HREF="node113.html">Preconditioner routines</A>
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<B> Previous:</B> <A NAME="tex2html1653"
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HREF="node113.html">Preconditioner routines</A>
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<B> <A NAME="tex2html1661"
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<B> Next:</B> <A NAME="tex2html1670"
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HREF="node115.html">mm_mat_read Read</A>
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<B> Up:</B> <A NAME="tex2html1666"
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HREF="node112.html">Utilities</A>
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<B> Previous:</B> <A NAME="tex2html1660"
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HREF="node113.html">hb_read Read</A>
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<B> <A NAME="tex2html1668"
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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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<H2><A NAME="SECTION000111000000000000000">
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psb_precinit -- Initialize a preconditioner</A>
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<H2><A NAME="SECTION000102000000000000000">
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hb_write -- Write a sparse matrix to a file
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in the Harwell-Boeing format</A>
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</H2>
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<P>
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<PRE>
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call psb_precinit(prec, ptype, info)
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</PRE>
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<BR>
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<IMG
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WIDTH="538" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img150.png"
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ALT="\begin{lstlisting}
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call hb_write(a, iret, iunit, filename, key, rhs, mtitle)
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\end{lstlisting}">
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<BR>
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<P>
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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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<DT><STRONG><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>ptype</STRONG></DT>
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<DD>the type of preconditioner.
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Scope: <B>global</B>
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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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Type: <B>required</B>
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Type:<B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: a character string, see usage notes.
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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><B>On Exit</B></STRONG></DT>
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<DD><P>
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<DT><STRONG>b</STRONG></DT>
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<DD>Rigth hand side.
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<BR>
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Type: <B>Optional</B>
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<BR>
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An array of type real or complex, rank 1 and having the ALLOCATABLE
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attribute; will be allocated and filled in if the input file contains
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a right hand side.
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</DD>
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<DT><STRONG>prec</STRONG></DT>
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<DD>Scope: <B>local</B>
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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>required</B>
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Type:<B>optional</B>.
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<BR>
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Intent: <B>inout</B>.
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<BR>
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Specified as: a preconditioner data structure precdata<TT>psb_prec_type</TT>.
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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>info</STRONG></DT>
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<DD>Scope: <B>global</B>
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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>required</B>
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Type:<B>optional</B>.
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<BR>
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Intent: <B>out</B>.
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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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<DT><STRONG>key</STRONG></DT>
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<DD>Matrix key.
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<BR>
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Error code: if no error, 0 is returned.
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Type: <B>Optional</B>
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<BR>
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A charachter variable of length 8 holding the
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matrix key as specified by the Harwell-Boeing format and to be
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written to file.
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</DD>
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</DL>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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Legal inputs to this subroutine are interpreted depending on the
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<IMG
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WIDTH="41" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img154.png"
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ALT="$ptype$"> string as follows<A NAME="tex2html30"
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HREF="footnode.html#foot7420"><SUP>3</SUP></A>:
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<DL>
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<DT><STRONG>NONE</STRONG></DT>
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<DD>No preconditioning, i.e. the preconditioner is just a copy
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operator.
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</DD>
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<DT><STRONG>DIAG</STRONG></DT>
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<DD>Diagonal scaling; each entry of the input vector is
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multiplied by the reciprocal of the sum of the absolute values of
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the coefficients in the corresponding row of matrix <IMG
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WIDTH="16" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img1.png"
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ALT="$A$">;
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</DD>
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<DT><STRONG>BJAC</STRONG></DT>
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<DD>Precondition by a factorization of the
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block-diagonal of matrix <IMG
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WIDTH="16" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img1.png"
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ALT="$A$">, where block boundaries are determined
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by the data allocation boundaries for each process; requires no
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communication. Only the incomplete factorization <IMG
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WIDTH="56" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img155.png"
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ALT="$ILU(0)$"> is
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currently implemented.
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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>Optional</B>
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<BR>
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A charachter variable of length 72 holding the
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matrix title as specified by the Harwell-Boeing format and to be
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written to file.
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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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<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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<HR>
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<!--Navigation Panel-->
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html1670"
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HREF="node115.html">mm_mat_read Read</A>
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<B> Up:</B> <A NAME="tex2html1666"
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HREF="node112.html">Utilities</A>
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<B> Previous:</B> <A NAME="tex2html1660"
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HREF="node113.html">hb_read Read</A>
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<B> <A NAME="tex2html1668"
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HREF="node1.html">Contents</A></B>
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