9.2 hb_write — Write a sparse matrix to a file in the Harwell–Boeing format

Type:

Asynchronous.

On Entry

a

the sparse matrix to be written.
Type:required.
Specified as: a structured data of type psb_Tspmat_type.

b

Rigth hand side.
Type: Optional
An array of type real or complex, rank 1 and having the ALLOCATABLE attribute; will be allocated and filled in if the input file contains a right hand side.

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 -.

key

Matrix key.
Type: Optional
A charachter variable of length 8 holding the matrix key as specified by the Harwell-Boeing format and to be written to file.

mtitle

Matrix title.
Type: Optional
A charachter variable of length 72 holding the matrix title as specified by the Harwell-Boeing format and to be written to file.

On Return

iret

Error code.
Type: required
An integer value; 0 means no error has been detected.