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ranking of vector with non-unique elements

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I need to perform fast ranking of the vector with non-unique elements, like in the following example:
F = [10.1 31.0 20.5 20.5 10.1] -> rankF = [3 1 2 2 3]
So far I am using the following code:
[~,~,iFu] = unique(F,'stable');
[~,iFs] = sort(F,'descend');
[~,iFs] = sort(iFs);
[~, ~, rankF] = unique(iFs(iFu));
But, I am not sure if this code is really effective. Is there any better (faster) way how to solve this problem?

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Accepted Answer

Johannes Fischer
Johannes Fischer on 18 Sep 2019
So you want to order starting with the highest value?
F = [10.1 31.0 20.5 20.5 10.1]
[~, ~, rankF] = unique(max(F)-F)

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Bruno Luong
Bruno Luong on 18 Sep 2019
+1 I like it.
But the MAX is not needed.
[~, ~, rankF] = unique(-F)

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