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  7.7.1 Arithmetic Matrix Operations
  MAT operators perform matrix assignment, addition, sub-
  traction, and multiplication.

  All of these operations use the keyword MAT, followed by an
  expression. If the array has not been previously dimensioned,
  these operations create an array. The created output array's
  dimensions depend on the operation performed but must be
  (10,10) or smaller.


                                            Note

        You can use the MAT operators on arrays larger than
        (10,10) if the input and output arrays are explicitly
        created or received as a formal parameter.