Why am I unable to use the RESHAPE function to convert a sparse vector to a three-dimensional matrix in MATLAB?

I create the following sparse vector:

A = sparse([1:24]);

Then I use the RESHAPE function to convert it to a 2-by-3-by-4 matrix:

B = reshape(A,2,3,4);

size(B)

However when I check the size of the result matrix, it is not what I am expecting:

 ans =

      2    12

Answer 1

[MathWorks Support Team]

MATLAB only supports two-dimensional sparse matrices. Therefore, when given a sparse matrix, the RESHAPE function returns a matrix, the second dimension of which has a length that is the product of all specified dimensions higher than the first.