How to find the 5th highest value in a matrix

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Smit Patel 2020-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/502641-how-to-find-the-5th-highest-value-in-a-matrix

评论： Smit Patel 2020-1-29

采纳的回答： John D'Errico

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I am trying to find the 5th highest value of a two-dimensional matrix.

For ex)

t_1=rand(3,3)
t_2=unique(t_1)
t_3=maxk(t_2,5) 

So I tried that but it gives me all the 5 values. I don't want all 5 in decreasing order till i get 5th highest. I just want 5th highest value. I thought of using this:

t_1=rand(3,3)
t2=sort(t_1,'descend')
t3=t2(5)

But this is only gonig to work if its 3by3. what if it was some big 5by5 or 7by7. I can't use that. It wont give me the fifth highest. or will it?

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Answer 1

John D'Errico 2020-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/502641-how-to-find-the-5th-highest-value-in-a-matrix#answer_412705

编辑：John D'Errico 2020-1-29

Can you convert a fully generally shaped array into a vector? Hint: What does t(:) do?

That works on an array of any shape or size. Since it does convert an array into a vector, then does your sort trick now work, ALWAYS? (Yes.)

You could also have used the reshape function, but that takes slightly more typing, so why bother? Still only one line to do so, but we need to conserve, even if it is only a few extra bits of text. ;-)