Problem 17. Find all elements less than 0 or greater than 10 and replace them with NaN

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 an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN.</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 =  [  5  17 -20  99  3.4  2  8  -6 ]\n Output y is [  5 NaN NaN NaN  3.4  2  8 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

39063 Solutions
15702 Solvers

Last Solution submitted on Sep 18, 2020

Last 200 Solutions

Problem Comments

12 Comments

12 Comments

Show 9 older comments

James Ross on 16 Jun 2012

This is a poorly posed problem. There are no numbers that are both less than zero and greater than 10.

Alexander on 17 Jan 2013

Just had the same thought as James Ross...

Ned Gulley on 20 Jun 2013

Fixed the wording to reflect this. Thanks for the comments.

ricardo gunawan on 14 Jul 2013

come on wth is this problem i got wrong when i check my answer is true

Matt Raum on 20 Aug 2013

Can someone explain this to me?

cleanUp=@(lb,x)interp1([lb 10],[lb 10],x);x=[5 17 -20 99 3.4 2 8 -6];y_correct=[5 NaN NaN NaN 3.4 2 8 NaN];
[isequalwithequalnans(cleanUp(1,x),y_correct),isequalwithequalnans(cleanUp(0,x),y_correct)]

That is, if i set the lower bound (lb) of the interpolation to 1 it passes the test code but if I set it to zero it fails with the same output!?!

Jean-Marie Sainthillier on 20 Aug 2013

The 3.4 in the result isn't the same in the two interpolations (diff= 4.440892098500626e-16). It's small but it's enough to fail the isequal test.

Felipe on 30 Apr 2014

16 is the first non-regexp-solution!

Kirti Raikar on 23 Jun 2015

good question

Thibault Clayeux on 15 Oct 2015

I have Assertion failure for the first test but it's good for the second --' I don't understand. Can you help me ?

Márk Barta on 10 May 2019

More usefull than I thougth

Abbie Lund on 25 Jul 2019

useful basics

Hoang Vu on 22 Sep 2019

hay

Solution Comments

Solution 2245278

1 Comment

1 Comment

Haoyu Dai on 30 Apr 2020

function y = cleanUp(x)
y = x;
L=length(y);
for i=1:L
if (y(i)<0)|(y(i)>10)
y(i)=NaN;
end
end
end

Solution 1639998

1 Comment

1 Comment

Tong Wang on 19 Oct 2018

this hasn't been fixed?

Solution 1603930

1 Comment

1 Comment

Lalit Kumar on 8 Aug 2018

good

Solution 1350850

1 Comment

1 Comment

Caleb Ogline on 20 Nov 2017

Solution 1247310

1 Comment

1 Comment

xinyu lei on 7 Aug 2017

I reduce my code size with the help in this page.

http://matlabtricks.com/post-16/the-background-of-cody-solutions-having-extremely-low-size.

Besides, leading solution is a cheater.

Solution 1101510

1 Comment

1 Comment

SIVAPRAKASH DANABALASINGAM on 10 Jan 2017

very easy

Solution 926888

1 Comment

1 Comment

Ethan Colaizzi on 24 Jul 2016

Nicely done!

Solution 924994

2 Comments

2 Comments

Md Sumon on 19 Jul 2016

How can I make it shorter?

James Tanner on 26 Jun 2017

You could remove the 1's:
i= 1:length(x)
and
x(i)<0 | x(i)>10
Also, it's probably best to use numel instead of length.

Solution 904589

1 Comment

1 Comment

Giovanni Mottola on 7 Jun 2016

First non trivial one, learned a new trick

Solution 781594

2 Comments

2 Comments

Md Tariqul Islam on 23 Nov 2015

Any suggestion on how to reduce the size?

Tanzil Bin Hassan on 2 Jan 2016

x(x < 0 | x > 10) = NaN // use this it will reduce code size

Solution 529557

3 Comments

3 Comments

Abhilash on 16 Nov 2014

Tried using accumarray on an experimental basis... freaky awesome!!!

Michèle on 13 Jul 2015

Learned from your Solution about accumarray -thanks for sharing it!

Tong Liu on 30 Dec 2015

excellent,man!

Solution 450065

1 Comment

1 Comment

Mohapi Mohlamonyane on 4 Jun 2014

This is called logical indexing

Solution 434566

1 Comment

1 Comment

Vishal on 23 Apr 2014

good

Solution 360653

1 Comment

1 Comment

Hussain on 27 Nov 2013

No need of colon operator...

Solution 327049

6 Comments

6 Comments

Show 3 older comments

Patricia on 3 Dec 2013

How does the cleanup function work? I did not find a good explanation, but would be interested in how it works.

Dmitry Kislitsyn on 14 Jan 2014

I don't understand how this size is possible. Even something as simple as y=x+1; has size 12 according to "About Cody" page! Kind of mystery for me...

Dmitry Kislitsyn on 14 Jan 2014

So I googled and found an explanation here http://matlabtricks.com/post-16/the-background-of-cody-solutions-having-extremely-low-size

So it is indeed a sort of cheating? I wonder why it is allowed...

Mariano on 17 Feb 2014

So do I. Wonder, I mean.

Camille Douay on 7 Nov 2014

Thank you for the solution of the extremely low size solution

Dougal on 6 Mar 2015

It's ironic. The size metric is meant to create most elegant solutions. At the same time it's more fun this way.

Solution 300604

1 Comment

1 Comment

Graig Ganitano on 10 Aug 2013

Straight forward with a for loop. Could definitely be improved considering good code doesn't use loops.

Solution 297871

1 Comment

1 Comment

Shashikiran Rajashekar on 7 Aug 2013

Checkout the built-in function "regexp"

Solution 287409

1 Comment

1 Comment

Hassan Javaid on 23 Jul 2013

this code works but its score is 51 and thats not good.... so can anyone improve it i'll be grateful.

Solution 266710

1 Comment

1 Comment

Li Yjie on 28 Mar 2015

are you ok?

Solution 264474

1 Comment

1 Comment

Bora Eryilmaz on 20 Jun 2013

There can be no elements with <0 AND >10. The problem statement should say <0 OR >10.

Solution 240231

2 Comments

2 Comments

Sharan Girdhani on 5 May 2013

I can't understand why is it coming out wrong?? o.O

Kirk on 18 Dec 2013

You would need a loop going through each element of x to finish this... a very bad idea..

Solution 191263

1 Comment

1 Comment

Muhammad Imran on 15 Jan 2013

hmmm

Solution 166158

2 Comments

2 Comments

Praveen Suvarna on 21 Nov 2012

function y = cleanUp(x)
x=[5 17 -20 99 3.4 2 8 -6]
for i=1:8
if (x(i)<0||x(i)>10)
y(i)=NaN;
else
y(i)=x(i);
end
end

Can anybody tell what is wrong with this code so that it is not clearing test 2.

Aditya Suryavanshi on 24 Dec 2012

Check this:Solution 181284.
x is input matrix which will vary rather being defined as in above program.

Solution 113939

1 Comment

1 Comment

Ricardo on 17 Jul 2012

Ins't there an even easir way of doing this?

Solution 103915

2 Comments

2 Comments

Ahmad on 16 Sep 2012

Brilliant

Anirudh Iyer on 15 May 2013

impressive!

Solution 20525

1 Comment

1 Comment

Mark on 1 Feb 2012

Does not work because of rounding error

Solution 14798

1 Comment

1 Comment

Vedad on 21 Apr 2012

Inefficient code... My solution took 0.022746sec while this one took 0.255477. Although the size was 19...

Solution 8254

1 Comment

1 Comment

Sripathi Sriharsha on 27 Jan 2012

It is working when I try!?

Problem Recent Solvers15702

Problem Tags

basic matlab data cleaning

Problem 17. Find all elements less than 0 or greater than 10 and replace them with NaN

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers15702

Suggested Problems

More from this Author95

Problem Tags

Problem 17. Find all elements less than 0 or greater than 10 and replace them with NaN

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers15702

Suggested Problems

More from this Author95

Problem Tags

Players