Delete a plane (2d) within a 3d matrix

Hi, I have a 3D matrix with a size of 256x256x256. I would like to delte the first plane (so in 2D) seen from the top, the bottom, from left and from right. How can I compute this using matlab?

[Zehra Ese]

So at the end I should have a matrix size of 254x254x254.

Answer 1

[John D'Errico]

Sometimes it is simpler to take what you want, than it is to delete what you don't want. Here is a matrix:

A = rand(256,256,256);

Clearly you know the size.

B = A(2:255,2:255,2:255);

Which elements are no longer present in B compared to A? If you don't want to create a new matrix, then just assign the result back into the variable A.