each diagonal of a matrix

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i want sum diagonal matrix like this pic. please help me

Answer 1

[Star Strider]

Try this:

A = [1 2 3;  4 5 6;  7 8 9];

Af = fliplr(A);                                     % Flip Matrix
ND = size(A,1)-1;                                   % Number of Diagonals
D = ND:-1:-ND;                                      % Diagonal Offset Vector
for k = 1:numel(D)
    Dsum(k) = sum(diag(Af,D(k)));                   % Sum Each Diagonal
end

[tomy gn]

thank you very much

[Star Strider]

As always, my pleasure!