Extracting a 2 dimensional array from a 3 dimensional matrix.

If I have a 3 dimensional matrix, with rows 1 through 10, columns a through z and pages 1 through 4, how do I extract a 2 dimensional array containing the leftmost slab of data, that is, all the column "a" data for all four pages? This would be a 10 x 4 array, with all the data from columns "a" (or 1 if you prefer numeric).

I will rearrange said data, and then want to reinstall the rearranged data in its original place in the 3 dimensional matrix.

Any help would be appreciated.

Answer 1

[Joseph Cheng]

so you have a matrix of 10 rows, 26 columns and 4 deep. That would be a 10x26x4 matrix. to get just all rows for column a for all pages is this example that is a bit easier to see

    Testmat= randi(10,2,3,4);))
    A = squeeze(Testmat(:,1,:))
    A = A*0
    Testmat(:,1,:) = A

Answer 2

[Zhuang Min Choo]

What if don't use the function "squeeze" to find the answer, any other options?

[Stephen23]

permute