Problem 1927. Find nth maximum

Created by Awadhesh Srivastava

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Find nth maximum in a vector of integer numbers. Return NaN if no such number exists.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ x = [2 6 4 9 -10 3 1 5 -10];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>So</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>n_max(x,3) would find 3rd maximum value in x which is 5</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>n_max(x,8) would find 8th maximum value in x which is -10</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>n_max(x,9) would find 9th maximum value in x which is -10</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"ListParagraph\"/><w:numPr><w:numId w:val=\"1\"/></w:numPr></w:pPr><w:r><w:t>n_max(x,12) does not exist so return NaN</w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

1114 Solutions
380 Solvers

Last Solution submitted on Apr 09, 2021

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

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.

Solution Comments

Solution 333168

2 Comments

2 Comments

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 Recent Solvers380

Problem Tags

n th max number theory

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 1927. Find nth maximum

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers380

Suggested Problems

More from this Author2

Problem Tags

Community Treasure Hunt

Problem 1927. Find nth maximum

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers380

Suggested Problems

More from this Author2

Problem Tags

Community Treasure Hunt

Players