User`s guide

Optimizing Arrays
6-5
If you compile this with the -O none option, you get
...
mlfAssign(
&y,
mclMtimes(
mlfDoubleMatrix(2, 2, _array0_, (double *)NULL),
mlfDoubleMatrix(2, 2, _array1_, (double *)NULL)));
...
Compiling with -O none -O fold_non_scalar_mxarrays:on gives
...
mlfAssign(&y, _mxarray4_);
...
Scalars
(fold_mxarrays) This option is equivalent to using both
fold_scalar_mxarrays and fold_non_scalar_mxarrays. It is included for
compatibility with P-code generation.