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<TITLE>hb_read -- Read a sparse matrix from a file in the Harwell-Boeing format</TITLE>
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<H1><A NAME="SECTION000100000000000000000"></A>
<A NAME="sec:util"></A>
<BR>
Utilities
</H1>
<P>
We have some utitlities available for input and output of
sparsematrices; the interfaces to these routines are available in the
module <code>psb_util_mod</code>.
<P>
<BR><HR>
<!--Table of Child-Links-->
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<LI><A NAME="tex2html1375"
HREF="node96.html">hb_read -- Read a sparse matrix from a file in the
<H2><A NAME="SECTION000101000000000000000">
hb_read -- Read a sparse matrix from a file in the
Harwell-Boeing format</A>
<LI><A NAME="tex2html1376"
HREF="node97.html">hb_write -- Write a sparse matrix to a file
in the Harwell-Boeing format</A>
<LI><A NAME="tex2html1377"
HREF="node98.html">mm_mat_read -- Read a sparse matrix from a
file in the MatrixMarket format</A>
<LI><A NAME="tex2html1378"
HREF="node99.html">mm_vet_read -- Read a dense vector from a
file in the MatrixMarket format</A>
<LI><A NAME="tex2html1379"
HREF="node100.html">mm_mat_write -- Write a sparse matrix to a
file in the MatrixMarket format</A>
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<BR><HR>
</H2>
<P>
<PRE>
call hb_read(a, iret, iunit, filename, b, mtitle)
</PRE>
<P>
<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>
<DL>
<DT><STRONG><B>On Return</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>a</STRONG></DT>
<DD>the sparse matrix read from file.
<BR>
Type:<B>required</B>.
<BR>
Specified as: a structured data of type spdata<TT>psb_spmat_type</TT>.
</DD>
<DT><STRONG>b</STRONG></DT>
<DD>Rigth hand side(s).
<BR>
Type: <B>Optional</B>
<BR>
An array of type real or complex, rank 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>mtitle</STRONG></DT>
<DD>Matrix title.
<BR>
Type: <B>Optional</B>
<BR>
A charachter variable of length 72 holding a copy of the
matrix title as specified by the Harwell-Boeing format and contained
in the input file.
</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>
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