Argmin with several minimums

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Martin 2013-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/80124-argmin-with-several-minimums

Hi,

I would like to find a function returning, given an array Data of doubles, an array containing all the indices of Data's minimums. Does it exist?

Thanks!

Edit: How to do in the particular case the minimum is 1?

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Walter Roberson 2013-6-25

Is this a vector to be worked on, and you want to return a possible vector of indices?

Is this an array to be worked on, and the minimum is to be taken over the entire array and the indices are to be the sequential indices numbers ("ind")?

Is this an array to be worked on, and the minimum is to be taken over one of the dimensions, with a vector of indices for each collapsed dimension? e.g., min of a 2D array per row, and vector of indices per row reflecting the min over that one row?

Martin 2013-6-25

I think an example would be clearer.

I search a function Fun that returns:

Fun([1 2 3]) --> 1 Fun([2 3 6 8 4 9 2]) --> [1 7] Fun([1 0 1 0 1 0 1 0]) --> [2 4 6 8]

Is it clearer? Does this exist?

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Answer 1

Richard Brown 2013-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/80124-argmin-with-several-minimums#answer_89834

在 MATLAB Online 中打开

It doesn't feel very satisfactory, but this will do the trick

I = find(A == min(A))

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Martin 2013-6-25

That's great. Thank you!

Walter Roberson 2013-6-25

Yes, that will work for vector input. It will not work for array inputs, which have not really been ruled out yet (giving an example with vectors is not the same thing as saying that non-vectors will not be used.)

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