MATLAB Matlab- summing of vectors in a matrix

[jaobyccdee]

I have a 8000x600 Matrix called V. How can i add the colume 1,5,9,13,17... (all colume of (4*i+1) for i from 0 to 149) of the vector?

 

[kai_sikorski]

Say that the matrix is called V

i = [0:149]*4 +1;
sum(V(:,i)');