Problem 109. Check if sorted

Created by AMITAVA BISWAS

Solve Later

Check if sorted.

Example:

 Input  x = [1 2 0]
 Output y is 0

Solve

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8606 Solutions
4447 Solvers

Last Solution submitted on Oct 21, 2025

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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!

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Problem 109. Check if sorted

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Problem 109. Check if sorted

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