Addition of 3D matrices

Hi,

I have a matrix that looks like this:

M(:,i,X,Y) that gives an answer of another matrix with dimension of 3*1 when multiplied by another matrix of 3*1.

The values for i = 1:5, for X and Y = 1:3, and : is variable.

Now what I want to do is to add together all values of M(:,1,X,Y) {meaning for the whole ranges of X and Y}, and similarly for all of M(:,2,X,Y), M(:,3,X,Y), M(:,4,X,Y) and M(:,5,X,Y).

Would someone kindly show me how to do that?

BW AA

[Jan]

Do I understand correctly: You have a Matrix M of the size [N x 5 x 3 x 3]?

Answer 1

[Walter Roberson]

squeeze(sum(M,1))

Answer 2

[Jan]

Perhaps this helps:

n = 100;
M = rand(n, 5, 3, 3);
P = reshape(permute(M, [1,3,4,2]), n * 3 * 3, 5);
Result = sum(P, 4);