The MMULT| instruction.

This multiplication takes 3 arguments: 2 objects at levels 3 and 2, and a real at level 1: the product type:

• 0: matrix, matrix
• 1: matrix, vector
• 2: matrix, scalar,
• 3: vector, scalar
• 6: scalar, matrix
• 7: scalar, vector

It is useless in interactive mode (if you plan to write your own program over Erable, you may need MMULT to switch to internal mode data representation for speed).