Problem 1927. Find nth maximum

Created by Awadhesh Srivastava

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Find nth maximum in a vector of integer numbers. Return NaN if no such number exists.

 x = [2 6 4 9 -10 3 1 5 -10];

n_max(x,3) would find 3rd maximum value in x which is 5
n_max(x,8) would find 8th maximum value in x which is -10
n_max(x,9) would find 9th maximum value in x which is -10
n_max(x,12) does not exist so return NaN

Solve

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Last solution submitted on Sep 12, 2019

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J.R.! Menzinger on 10 Oct 2013

I think the test cases are not correct. Can you check this?

Sky Sartorius on 10 Oct 2013

The test cases expect isequal(NaN,NaN) to return true. This is wrong.

J.R.! Menzinger on 10 Oct 2013

please use the function "isquealn" http://www.mathworks.de/de/help/matlab/ref/isequaln.html

Ned Gulley on 15 Oct 2013

I went ahead and made the test suite change that José suggested above.

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Solution 333168

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Ned Gulley on 15 Oct 2013

Clever! If the system doesn't work properly, work around it.

Alfonso Nieto-Castanon on 15 Oct 2013

Thanks :) in retrospect I probably should have overloaded isequal with isequalwithequalnans instead, but I guess this makes a similar point... (and if you are interested, the whole 'singularity' series of problems is devoted to "work arounds" for this sort of ill-defined testsuites)

Problem 1927. Find nth maximum

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