I have matrix K and Z

Question

jane 2022-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/1751905-i-have-matrix-k-and-z

评论： KALYAN ACHARJYA 2022-7-1

K = [[ 12, 50, 15, 99, 61, 74 ,71],

[54, 23, 14, 13, 16, 89,67],

[12, 45, 78, 90, 12, 56, 16]].

Z = [[ 0, 1, 0, 0, 0, 0.1],

[ 0, 0, 0, 0 , 0, 0, 0]],

[ 0, 0 , 1, 0 , 0, 0,0]],

How to make the value of the first row in the K matrix be 0 if the Z matrix contains the number 1.

for example in the first row in the Z matrix there is a value of 1, how do you make the values in the first row (12, 50, 15, 99, 61, 74 ,71) of the K matrix become ( 0, 0, 0, 0, 0, 0 , 0). Thanks

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Answer 1

David Hill 2022-7-1

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s=logical(sum(Z,2));
K(s,:)=0;

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Answer 2

KALYAN ACHARJYA 2022-7-1

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编辑：KALYAN ACHARJYA 2022-7-1

Another way:

K = {[12, 50, 15, 99, 61, 74 ,71];[54, 23, 14, 13, 16, 89,67];[12, 45, 78, 90, 12, 56, 16]};
Z = {[ 0, 1, 0, 0, 0, 0.1];[ 0, 0, 0, 0 , 0, 0, 0];[ 0, 0 , 1, 0 , 0, 0,0]};
for i=1:length(Z)
    if  any( Z{i}==1)
        dat=length(K{i});
        K{i}= zeros(1,dat);
    end 
end 
K
K = 3×1 cell array
    {[       0 0 0 0 0 0 0]}
    {[54 23 14 13 16 89 67]}
    {[       0 0 0 0 0 0 0]}