How to sum elements of matrix in certain condition?

2 views (last 30 days)
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.

Accepted Answer

Cris LaPierre
Cris LaPierre on 16 Jan 2022
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

More Answers (0)

Categories

Find more on Multidimensional Arrays in Help Center and File Exchange

Products


Release

R2016a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!