Directly using Index of max value without storing
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Matthew Knights
le 26 Juil 2016
Commenté : Matthew Knights
le 26 Juil 2016
Hi,
I want to use the index of a maximum value in a vector directly without storing it as a variable. i.e:
I have a vector X = [1 3 2 9 2 1], and a vector Y = [10 20 30 50 60 70] and I want to extract the value in Y corresponding to the max value in X. I know I can use:
[M,I] = max(X); then
Value = Y(I);
But I can't work out how to do this in a single line without storing the value of "I", to acheive something like:
Value = Y(...index of max value of X...)
Any help greatly appreciated.
Thanks,
Matt
2 commentaires
Stephen23
le 26 Juil 2016
@Matthew Knights: what output do you want if there are two identical maximum values ? E.g.:
X = [1 3 2 9 2 9]
Y = [10 20 30 50 60 70]
value = ???
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Guillaume
le 26 Juil 2016
This is one of the downside of matlab's syntax. It is not possible to chain expressions that use anything but the 1st return value. You have to use a temporary variable.
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Andrei Bobrov
le 26 Juil 2016
out = Y(max(X)==X)
4 commentaires
Guillaume
le 26 Juil 2016
Certainly not! There's no guarantee that the value in Y would be the same for identical max values in X.
This would work:
Y(find(max(X) == X, 1))
as long as X and Y are vectors. Reproducing the same behaviour for matrices would be harder.
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