Place(s) of greatest deviation

Question

Ulrik Nash 2011-5-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/7480-place-s-of-greatest-deviation

Hi Everyone,

Suppose I have a vector Y:

Y = [0 0 0 0.5 0.5]

and a vector X

X = [0 0 0 1 1]

Now I wish to find the place of greatest (absolute) deviation between Y and X. Now, there are two such places, but if I use the following:

[~,I] = max(abs(X-Y))

then the answer is always 4. But 5 has an equally large deviation. What I really wish in such ties is to be returned a random place (out of the ties).

Any hints how to solve this problem?

Regards,

Ulrik.

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Answer 1

Oleg Komarov 2011-5-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/7480-place-s-of-greatest-deviation#answer_10275

在 MATLAB Online 中打开

Y = [0 0 0 0.5 0.5];
X = [0 0 0 1 1];
absdiff = abs(X-Y);
pos     = find(max(absdiff) == absdiff); % or [trash,pos] = ismember(max(absdiff),absdiff);
pos(randi(numel(pos),1))

Try to execute several times to see the random selection between position 4 and 5.