the sparse matrix to be written. Type:required. Specified as: a structured data of type psb_Tspmat_type.
mtitle
Matrix title. Type: required A charachter variable holding a descriptive title for the matrix to be
written to file.
filename
The name of the file to be written to. Type:optional. Specified as: a character variable containing a valid file name, or -, in
which case the default output unit 6 (i.e. standard output 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
iret
Error code. Type: required An integer value; 0 means no error has been detected.