Problem 1927. Find nth maximum

Created byAwadhesh Srivastava

Like (5)

Solve Later

{“关系”:[{“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

1692 Solutions
564 Solvers

LastSolutionsubmitted on Jul 12, 2022

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

J.R.! Menzingeron 10 Oct 2013

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

Sky Sartoriuson 10 Oct 2013

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

J.R.! Menzingeron 10 Oct 2013

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

Ned Gulleyon 15 Oct 2013

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

解决方案Comments

Solution 333168

2 Comments

2 Comments

Ned Gulleyon 15 Oct 2013

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

Alfonso Nieto-Castanonon 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 Solvers564

Problem Tags

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

解决方案Comments

Problem Recent Solvers564

Suggested Problems

More from this Author2

Problem Tags

Community Treasure Hunt

Problem 1927. Find nth maximum

Solution Stats

Last 200 Solutions

Problem Comments

解决方案Comments

Problem Recent Solvers564

Suggested Problems

More from this Author2

Problem Tags

Community Treasure Hunt

Players