Problem 38. Return a list sorted by number of occurrences

Created by Cody Team

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>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>"}]}

Solve

Solution Stats

3658 Solutions
1632 Solvers

Last Solution submitted on Jul 27, 2021

Last 200 Solutions

Problem Comments

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

Problem Recent Solvers1632

Problem Tags

sorting vectors

Community Treasure Hunt

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

Start Hunting!

Problem 38. Return a list sorted by number of occurrences

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1632

Suggested Problems

More from this Author95

Problem Tags

Community Treasure Hunt

Problem 38. Return a list sorted by number of occurrences

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1632

Suggested Problems

More from this Author95

Problem Tags

Community Treasure Hunt

Players