How to create a m by n matrix in which each element be another p by q matrix?

I would like to create a 100 by 100 matrix in which each element would be p by q matrix. How? Thanks

Answer 1

[John D'Errico]

You cannot do so, as a regular 2-d matrix. (As Roger pointed out.)

You can do so easily enough however, using a 4-dimensional array.

A = rand(p,q,100,100);

A is a 4-d array. You can create the array in a variety of ways. I used random elements. But now

A(:,:,i,j)

is a pxq matrix, as you desire.

[Roger Stafford]

Good point!

Answer 2

[Roger Stafford]

You cannot do that with matrices. Each of their elements must be a single scalar quantity. However, you can do such things using cell arrays.