How to sum elements of matrix in certain condition?

Hello everyone. I'm sorry if i didn't explain it clearly. I have a matrix like

A =
        1.0999   -1.0999   -2.0590         0   -1.0999         0         0
             0         0    0.1168   -0.1168         0   -1.0999         0
       -2.4128         0         0   -5.2622         0         0    2.4128

I want a new matrix with the same size. The element of new matrix is a sum of other elements in the same column. For example, A(1,1) = 1.0999. The new matrix B(1,1) is a sum of 0 and -2.4128, so B(1,1)=-2.4128. Based on that condition, the new desired matrix is

B =
       -2.4128         0    0.1168   -5.3790         0   -1.0999    2.4128
       -1.3129   -1.0999   -2.0590   -5.2622   -1.0999         0    2.4128
        1.0999   -1.0999   -1.9422   -0.1168   -1.0999   -1.0999         0

All answer will be appreciated. Thank you very much.

Answer 1

[Cris LaPierre]

A = [1.0999   -1.0999   -2.0590         0   -1.0999         0         0;
    0         0    0.1168   -0.1168         0   -1.0999         0;
    -2.4128         0         0   -5.2622         0         0    2.4128];

B = [sum(A([2 3],:)); sum(A([1 3],:)); sum(A([1 2],:))]

B = 3×7

-2.4128 0 0.1168 -5.3790 0 -1.0999 2.4128 -1.3129 -1.0999 -2.0590 -5.2622 -1.0999 0 2.4128 1.0999 -1.0999 -1.9422 -0.1168 -1.0999 -1.0999 0

[Jenjen Ahmad Zaeni]

Thank you very much!