cumsum of a matrix

Hi there I have a nxm matrix. I want to do the cumsum of each column, then all of them added up to give one total cumsum.

Any help?

Answer 1

   X = 1:100;
   X = reshape(X,10,10);
   X1 = cumsum(X(:));

Answer 2

Is this what you mean?

M = rand(5,6);
S = sum(cumsum(M),2);