Find row in a matrix A corresponding to the row another matrix B

Question

Ricardo Gutierrez 2018-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/409491-find-row-in-a-matrix-a-corresponding-to-the-row-another-matrix-b

回答： Ricardo Gutierrez 2018-7-9

采纳的回答： Paolo

在 MATLAB Online 中打开

Good Morning.

I hope you are well and also I hope you help me with your advice to find the solution.

I have an A matrix of 6 X 10 as an example:

   -1.3726   -0.7760   -0.6715   -0.2796   -0.1499    0.1499    0.2796    0.6715    0.7760    1.3726
   -1.3726   -0.7760   -0.6715   -0.1796   -0.0499    0.0499    0.1796    0.6715    0.7760    1.3726
   -1.3726   -0.7760   -0.7715   -0.2796   -0.0499    0.0499    0.2796    0.7715    0.7760    1.3726
   -1.3726   -0.7760   -0.6715   -0.2796   -0.0499    0.0499    0.2796    0.6715    0.7760    1.3726
   -1.3726   -0.8760   -0.6715   -0.2796   -0.0499    0.0499    0.2796    0.6715    0.8760    1.3726
   -1.4726   -0.7760   -0.6715   -0.2796   -0.0499    0.0499    0.2796    0.6715    0.7760    1.4726

Each row is taken for a certain operation resulting in a matrix B_ 6 X 1:

B=[13.01; 13.14; 16.60; 20.05; 13.74; 12.48]

The first row of matrix A produces the first row of matrix B

The second row of matrix A produces the second row of matrix B and so on

The problem is that through Matlab code identify the maximum value and the posicon of vector B and know what elements of the row and position of that line of matrix A corresponds to it.

In this case it is visually known that the maximum in B is 20.05 and that it occupies the 4th row of the same matrix and therefore corresponds to the fourth row of matrix A with elements that are in that row, that is: -1.3726 -0.7760 -0.6715 -0.2796 -0.0499 0.0499 0.2796 0.6715 0.7760 1.3726

That's what I want to know: value and position of the maximum of B and position and values of the elements of vector A that produced that maximum value in B

I hope you have understood me and I am waiting for your help. Thank you.

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Answer 1

Paolo 2018-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/409491-find-row-in-a-matrix-a-corresponding-to-the-row-another-matrix-b#answer_328109

编辑：Paolo 2018-7-9

在 MATLAB Online 中打开

If I am understanding the question correctly the answer is simply:

 >>C = A(B==max(B),:)
 C =  Columns 1 through 7
   -1.3726   -0.7760   -0.6715   -0.2796   -0.0499    0.0499    0.2796
Columns 8 through 10
    0.6715    0.7760    1.3726