hb_read -- Read a sparse matrix from a file in the Harwell-Boeing format


\begin{lstlisting}
call hb_read(a, iret, iunit, filename, b, mtitle)
\end{lstlisting}

Type:
Asynchronous.
On Entry
filename
The name of the file to be read.
Type:optional.
Specified as: a character variable containing a valid file name, or -, in which case the default input unit 5 (i.e. standard input in Unix jargon) is used. Default: -.
iunit
The Fortran file unit number.
Type:optional.
Specified as: an integer value. Only meaningful if filename is not -.

On Return
a
the sparse matrix read from file.
Type:required.
Specified as: a structured data of type spdatapsb_Tspmat_type.
b
Rigth hand side(s).
Type: Optional
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.
mtitle
Matrix title.
Type: Optional
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.
iret
Error code.
Type: required
An integer value; 0 means no error has been detected.