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## mm_mat_read -- Read a sparse matrix from a file in the MatrixMarket format
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    call mm_mat_read(a, iret, iunit, filename)

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