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how to find argmin to this vector

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c=argmin f(a,b).where both a,b are M*1 and N*1 column matrices respectively.
How to get a,b for minimum value of f(a,b) from matlab


James Tursa
James Tursa on 24 Nov 2020
What does it mean to find the minimum value or index of two vectors with different lengths? Can you provide a short example of inputs and desired output?
Murali Krishna AG
Murali Krishna AG on 24 Nov 2020
Eg: Let function f=A^2+B^2+A*B+2*A^2*B
where A,B are known column matrices
Expect output A,B.
I want to find in which A,B matrices the functiuon f could be minimum

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Accepted Answer

KSSV on 24 Nov 2020
Are you looking for something like this?
Let a,b be your column matrices.
[a,b] = meshgrid(a,b) ; % make them a matrix
F = f(a,b) ; % evaluate your function, use element by element operations in f
[val,idx] = min(F(:)) ;
amin = a(idx) ;
bmin = b(idx) ;
Have a look on fmincon.


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