MATLAB: Creating multi-dimensional arrays from vectors

Question

Hi,

I want to create a multi-dimensional array 'b' from a vector 'a' as the following example:

a =

     1     2     3     4

b(:,:,1) =

     1     1
     1     1

b(:,:,2) =

     2     2
     2     2

b(:,:,3) =

     3     3
     3     3

b(:,:,4) =

     4     4
     4     4

Thus I want to copy each entry of 'a' as m by n (2 by 2 in the example) size matrices onto each level of 'b' along the third dimension. I need to avoid element-wise operations and be as fast as possible.

I would appreciate any help.

Thank you.

Answer 1

[~,~,b] = ndgrid([0 0], [0 0], a)