Return matrix of maximum values

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Manu Mensa 2019-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/446095-return-matrix-of-maximum-values

评论： Manu Mensa 2019-2-21

采纳的回答： madhan ravi

I have a matrix of the form:

a =

17 24 1 8 15

23 5 7 14 16

4 6 13 20 22

10 12 19 21 3

11 18 25 2 9

column 1 & 2 represent x,y positions while col 3-5 represent intensity. I obtained the maximum and index of the intensity for each position from [M,I] =max(a(:,3:5),[],1). I am struggling with how to obtain the x,y positions corresponding to each maximum intensity. Any help would be appreciated. Thanks.

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madhan ravi 2019-2-20

explicitly write your desired output

Manu Mensa 2019-2-20

Thank you very much.

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madhan ravi 2019-2-20

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x(I)
y(I)

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Stephen23 2019-2-21

编辑：Stephen23 2019-2-21

Or without intermediate variables:

>> [M,I] = max(a(:,3:5),[],1);
>> XY = [a(I,1),a(I,2)]
XY =
   11   18
   10   12
    4    6

Manu Mensa 2019-2-21

Thank you all very much. It worked.

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Jos (10584) 2019-2-20

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maxxy = zeros(3, 2) ; % pre-allocation
for k = 1:3
    [~, r] = max(M(:, k+2)) ; % row of maximum value in column k
    maxxy(k, :) = M(r, [1 2]) ;
end