Is there a function for argmax?
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I am looking for a function that selects the argmax value from a vector.
aux = argmax(P); %P is a normal vector
Supposedly there should a function directly called argmax, but is not working (error = Undefined function or variable 'argmax'). Is there any other function? (I am working with the 2017a version).
5 Kommentare
Anton Semechko
am 5 Jul. 2018
Bearbeitet: Anton Semechko
am 5 Jul. 2018
Use syntax
[P_max,id_max]=max(P);
Here, id_max is the index of P_max in P, so that P_max == P(id_max)
Antworten (2)
Image Analyst
am 5 Jul. 2018
It's probably some function that someone wrote, like the person who gave you the code. Ask them for it. Otherwise, can you tell us how aux is used? That may give us some clue as to what argmax gives. Like it really should be nargin (the number of input arguments) or the max value of some matrix inputted into the argument list or who knows what.
0 Kommentare
Alan
am 6 Jan. 2020
function y = argmax(x)
[~,y] = max(x);
end
3 Kommentare
Alan
am 7 Jan. 2020
That is a step more comprehensive, but to cover all the edge cases would need a lot more work. In my opinion, there should be a standard MATLAB function for this.
Walter Roberson
am 7 Jan. 2020
Easier I suspect to return
y == max(x, [], dim);
which would be a logical the same size as the original. That removes the need to worry about different sizes of output for different columns.
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