Problem 38. Return a list sorted by number of occurrences

Created by Cody Team

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{"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>Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Ties are resolved by a sort from lowest to highest.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>So if</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ x = [1 2 2 2 3 3 7 7 93]]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>then</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ y = [2 3 7 1 93]]]></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>"}]}

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4039 Solutions
1912 Solvers

Last Solution submitted on Sep 29, 2022

Last 200 Solutions

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2 Comments

2 Comments

Chul Min Yeum on 3 Jan 2020

Good problem!

Ahmed Nazir on 30 Sep 2020

It is easy if you use matlab function...

useful function ==> categorical, countcats , sort, unique

solution:
https://github.com/AhmedNazir/MatlabCody/blob/master/popularity.m

Solution Comments

Solution 580317

1 Comment

1 Comment

Ionut Barbu on 13 Aug 2017

this type of hack solutions should be banned

Solution 493731

1 Comment

1 Comment

Jonathan on 29 Aug 2014

The behavior of accumarray has changed. In R2012b, I used I = accumarray(I.', 1); and it worked. I had to remove the transpose to pass the test suite.

Solution 246301

1 Comment

1 Comment

Clemens Giegerich on 19 May 2013

Interesting cody behavior by masking anonymous functions with str2num...

Solution 177297

1 Comment

1 Comment

Baalzamon on 14 Dec 2012

Test Suite having a hissy fit because it wanted a col not a row o_O

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Problem 38. Return a list sorted by number of occurrences

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Problem 38. Return a list sorted by number of occurrences

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