MATMUL — matrix multiplicationRESULT = MATMUL(MATRIX_A, MATRIX_B)
     | MATRIX_A | An array of INTEGER,
REAL, COMPLEX, or LOGICAL type, with a rank of
one or two. 
 | 
| MATRIX_B | An array of INTEGER,
REAL, or COMPLEX type if MATRIX_A is of a numeric
type; otherwise, an array of LOGICAL type. The rank shall be one
or two, and the first (or only) dimension of MATRIX_B shall be
equal to the last (or only) dimension of MATRIX_A.
      | 
* or .AND. operators.