Double sum - vector (matrix) solution

Hi!

I want to calculate the expression , where C and F - matrix (n x m). How can I do it without loops?

Thank you for your answers!

Answer 1

[James Tursa]

result = sum(C(:).*F(:));

or for later versions of MATLAB

result = sum(C.*F,'all');

This all assumes that the actual indexing starts at 1, not 0 as your formula above is written, since MATLAB uses 1-based indexing.

[Mikl Nik]

Thank you!