# mm_mat_read — Read a sparse matrix from a file in the MatrixMarket format

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#### 9.3 mm_mat_read — Read a sparse matrix from a file in the MatrixMarket format

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

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