Using the C Math Library

Determining Array Shape

To determine the number of dimensions of an array, use the mlfNdims() routine. This code uses mlfNdims() to get the number of dimensions of a 2-by-3-by-2 array.

mxArray *A = NULL;
mxArray *ndims = NULL;

/* Create three-dimensional array */
mlfAssign(&A, mlfOnes(mlfScalar(2),
                      mlfScalar(3),
                      mlfScalar(2),
                      NULL));

/* Determine dimensions  */
mlfAssign(&ndims, mlfNdims( A ));

mlfFprintf(mlfScalar(1),
           mxCreateString("The array has %d dimensions"),
           ndims,
           NULL);

mxDestroyArray(A); 
mxDestroyArray(ndims);

This code outputs the value 3, indicating that the array C is a three-dimensional array.

Determining Array Size

Managing Array Memory