Problem 109. Check if sorted

Created by AMITAVA BISWAS

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>Check if sorted.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ Input  x = [1 2 0]\n Output y is 0]]></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

7760 Solutions
4006 Solvers

Last Solution submitted on Apr 12, 2021

Last 200 Solutions

Problem Comments

10 Comments

10 Comments

Show 7 older comments

Vivek on 30 May 2013

Sort means ascending or descending or both? Not clear

Geoffrey Akien on 7 Jul 2013

I agree! The code is significantly different for those possible cases.

Pascal Geschwill on 7 Jan 2014

Unfortunately, way too easy!

Matt Wolinsky on 10 Sep 2014

I agree it's not clear ... but
y = ~var(nonzeros(sign(diff(x))));
works for both ascending/descending cases.
(The test suite clarifies that ascending is the intended case)

Wang Yunhe on 16 Mar 2015

y = ~var(nonzeros(sign(diff(x)))); amazing~ ！nice idea

Sam Marshalik on 22 Jan 2016

There is a sort array command in MATLAB.

Muhammad M Sahari on 20 Dec 2016

if you are not familiar with array, will be difficult

Gan Wee Ting on 20 Dec 2016

nice

Jack Knoll on 6 Apr 2017

hehe

Georgios Stoumpis on 13 Jun 2017

The solution "y = issorted(x);" with a metric of 12 is not the leading solution. "Fair Play" is something unknown to cheaters!

Solution Comments

Solution 2051660

Solution 1185914

1 Comment

1 Comment

Informaton on 11 May 2017

Is it supposed to be sorted in ascending or descending order? I'll just pick randomly ...

Solution 1094297

1 Comment

1 Comment

TAYALAN SIVALINGAM on 29 Dec 2016

Solution 1028104

1 Comment

1 Comment

David Verrelli on 3 Sep 2018

This user (mohamed elbesealy) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV

Solution 932479

1 Comment

1 Comment

Oliver Penn on 6 Aug 2016

Similar to monotonically increasing problem.

Solution 788198

1 Comment

1 Comment

Alexey Sinitsin on 4 Dec 2015

That was hard

Solution 358715

1 Comment

1 Comment

Marcel on 24 Nov 2013

thank you Emilio

Solution 355411

1 Comment

1 Comment

Emilio on 19 Nov 2013

haha

Solution 327348

1 Comment

1 Comment

Shuo on 2 Oct 2013

Additional sort command takes extra node...

Solution 103932

2 Comments

2 Comments

Norbert Marwan on 2 Sep 2016

The leading solution (solution 103932) is wrong and doesn't work. The error is that the output argument "ans" is not assigned.

Jan Orwat on 2 Sep 2016

@Norbert, this trick worked in Cody before, now it doesn't. I wrote trick, cause it was a way to have a little bit lower Cody size. It was questioned why it's not banned, because it favours bad programming practices, so changes were made.

Solution 59623

2 Comments

2 Comments

Viktor on 11 Mar 2012

Hard one :)

Frequency Domain on 23 Jul 2013

facepalm

Problem Recent Solvers4006

Problem Tags

basic matlab sort

Community Treasure Hunt

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

Start Hunting!

Problem 109. Check if sorted

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers4006

Suggested Problems

More from this Author100

Problem Tags

Community Treasure Hunt

Problem 109. Check if sorted

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers4006

Suggested Problems

More from this Author100

Problem Tags

Community Treasure Hunt

Players