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Find the Argmin of a vector

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Mohsen Dlala
Mohsen Dlala 2020-8-8
评论： Matt J 2020-8-10
Help:
Let x be a vector and B_1...B_p p matrices,
I look for the index j* of the matrix such that
||B_j*||=min ||B_i x||, (||.||=norm)
How do I write this with matlab?
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Mohsen Dlala
Mohsen Dlala 2020-8-8
@Walter Roberson
As I'm a beginner in Matlab, I didn't understand anything, anyway, thank you very much for your answer.
Walter Roberson
Walter Roberson 2020-8-8
You have variables named B_ followed by a number, and you want to process the whole series of variables. That is bad programming practice. You should have avoided naming the variables that way, and should have used (for example) a cell array.
Are you trying to find which of the B_ arrays leads to the smallest norm given a vector x? If so then if you had the arrays represented as a cell array, that would only be a small number of statements.

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Matt J
Matt J 2020-8-8
编辑：Matt J 2020-8-9
You should have avoided naming the variables that way, and should have used (for example) a cell array.
Indeed. Here's an example of how to do it when that is the case.
Bcell={rand(5), rand(5), rand(5), rand(5)}; %B1,...,Bp p=4
[~, jstar] = min(cellfun(@(B) norm(B*x),Bcell)) %EDITED
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Matt J
Matt J 2020-8-10
You're very welcome, but please Accept-click the answer if you got it working.

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