I want to fix the zeros values in their same indices in certain two matrices A and B (to not be updated) in a cost function?

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M 2022-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/1806925-i-want-to-fix-the-zeros-values-in-their-same-indices-in-certain-two-matrices-a-and-b-to-not-be-upd

编辑： Voss 2022-9-17

I want to build a cost function, I want to fix the zeros values in their same indices in certain two matrices A and B (to not be updated) .

for example this is matrix A:

A = [ 0.1 0.2 0

0.2 0.8 0

0 0 0.7 ]

and I want to update this matrix by some computions, but I want to keep the zero values in their same indices and not update them.

Is there any sugestion to do that?

and in general is there a method to fix values in their same indices ( I mean do the calculation on the all values in this matrix but dont change these values; in my case the zero values)

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Answer 1

Voss 2022-9-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1806925-i-want-to-fix-the-zeros-values-in-their-same-indices-in-certain-two-matrices-a-and-b-to-not-be-upd#answer_1055060

编辑：Voss 2022-9-17

在 MATLAB Online 中打开

A = [0.1 0.2 0; 0.2 0.8 0; 0 0 0.7] 
A = 3×3
    0.1000    0.2000         0
    0.2000    0.8000         0
         0         0    0.7000
newA = [1 2 3; 4 5 6; 7 8 9]
newA = 3×3
     1     2     3
     4     5     6
     7     8     9
idx = A == 0;
A(~idx) = newA(~idx)
A = 3×3
     1     2     0
     4     5     0
     0     0     9