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<H2><A NAME="SECTION000101000000000000000">
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hb_read -- Read a sparse matrix from a file in the
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Harwell-Boeing format</A>
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</H2>
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<P>
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<PRE>
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call hb_read(a, iret, iunit, filename, b, mtitle)
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</PRE>
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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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<DD>
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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 read.
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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 input unit 5 (i.e. standard input
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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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<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>a</STRONG></DT>
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<DD>the sparse matrix read from file.
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<BR>
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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_spmat_type</TT>.
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</DD>
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<DT><STRONG>b</STRONG></DT>
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<DD>Rigth hand side(s).
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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 2 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, otherwise will be left in the UNALLOCATED state.
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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>Optional</B>
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<BR>
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A charachter variable of length 72 holding a copy of the
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matrix title as specified by the Harwell-Boeing format and contained
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in the input file.
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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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