Specifying values in 2D array when I know the indices

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MichailM 2022-11-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/1867893-specifying-values-in-2d-array-when-i-know-the-indices

评论： MichailM 2022-11-30

I have the short example below. With the max function I find the indices of the maximum values whithin each column of array A. I want an array C which will include the values of array B by using the idx values I specified before. So, C will be C = [1 2 3 4 5]. How can I do that without a for-loop?

A = [1 1 1 1 100;
1 1 1 1 
1 100 1 1
1 1 100 1;
100 1 1 1];
[~,idx] = max(A,[],1);
B = [1 1 1 1 5;
1 1 1 1 
1 3 1 1
1 1 4 1;
2 1 1 1];

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Answer 1

Fangjun Jiang 2022-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/1867893-specifying-values-in-2d-array-when-i-know-the-indices#answer_1116728

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A = [1 1 1 1 100;
    100 1 1 1 1 
    1 1 100 1 1
    1 1 1 100 1;
    1 100 1 1 1];
[~,idx] = max(A,[],1,'linear')
idx = 1×5
     2    10    13    19    21
B = [1 1 1 1 5;
    1 1 1 1 1 
    1 1 3 1 1
    1 1 1 4 1;
    1 2 1 1 1];
C=B(idx)
C = 1×5
     1     2     3     4     5