How do I find the location of the max value of a nd matrix efficiently?

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Shep Bryan
Shep Bryan 2020-2-22
回答： Walter Roberson 2020-2-22
How do I find the location of the maximum value of a nd matrix efficiently? Right now I am hard coding my search for up to 5 dimensions:
function out = maxi(X)
Ndim = length(size(X));
if Ndim == 2
[a,b] = ind2sub(size(X), find(X==max(X,[],'all')));
out = [a,b];
elseif Ndim == 3
[a,b,c] = ind2sub(size(X), find(X==max(X,[],'all')));
out = [a,b,c];
elseif Ndim == 4
[a,b,c,d] = ind2sub(size(X), find(X==max(X,[],'all')));
out = [a,b,c,d];
elseif Ndim == 5
[a,b,c,d,e] = ind2sub(size(X), find(X==max(X,[],'all')));
out = [a,b,c,d,e];
end
end
Is there a way to do this more efficiently and for arbitrary number of dimensions?

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采纳的回答

Walter Roberson
Walter Roberson 2020-2-22
[L{1:ndims(X)}] = ind2sub(size(X), max(X, [], 'all')) ;
out = cell2mat(L);
However if you want all the duplicates to show up then you would still use find()

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