Problem 22. Remove the vowels

Created by Cody Team

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15958 Solutions
5636 Solvers

Last Solution submitted on Apr 01, 2023

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10 Comments

10 Comments

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Jim on 26 Jan 2012

What about y in the second test?

Mattias on 3 Jan 2015

Why isn't y a vowel in english? In swedish we have nine vowels and y is one of them.

Zhao Dennis on 31 Mar 2015

There is only five vowels in English.That is 'a,e,i,o,u'.

ci on 25 Feb 2017

I don't understand why the following doesn't work:

expression = '[aeiouAEIOU]';
[~,noMatch] = regexp(s1,expression,'match','split');
[~,c] = size(noMatch);
cell_s2 = '';
for i = 1:c
cell_s2 = strcat(cell_s2,noMatch(i));
end
s2 = string(cell_s2);

Joan Watson on 22 May 2019

nice

Ahmed Nazir on 7 Sep 2019

#WARNING
Character Array And String are not similar.

length('abc')
% 3

length("abc")
% 1

so 'abc' is NOT EQUAL to "abc"

use "char" function to get character array from string

char("abc")
% 'abc'

Rasul Khan on 19 Jun 2020

using
if ~any(s1(i) == 'aeiouAEIOU')
makes it real easy

Shlomo Geva on 30 Nov 2020

The letters 'w' and 'y' are actually vowels.
(Perhaps not in Cody, perhaps not even in American English - I am not sure - but for certain they are in English...)

Tran Tran on 31 Jul 2022

Regexp Regexp

Tran Tran on 31 Jul 2022

Only 2 line of code thank for Regexp

Solution Comments

Solution 8794075

1 Comment

1 Comment

士元梁 on 25 Jul 2022

ismember aha

Solution 2246344

1 Comment

1 Comment

Haoyu Dai on 30 Apr 2020

function s2 = refcn(s1)
s2 = [];
s3='aAeEiIoOuU';
L=strlength(s1);
L1=strlength(s3);
flag=0;
j=1;
for i=1:L
for k=1:L1
if s1(i)==s3(k)
flag=1;
continue;
end
end
if flag==0
s2(j)=s1(i);
j=j+1;
end
flag=0;
end
end

Solution 1910169

1 Comment

1 Comment

Eugene Avrutin on 23 Aug 2019

why no accept

Solution 1732616

1 Comment

1 Comment

Corentin OGER on 21 Feb 2019

I can't make this work on my PC (Matlab 2016 doesn't support double quotes and string arrays)

Solution 1597675

2 Comments

2 Comments

Bhaskar R on 2 Aug 2018

s1 = 'I don''t want to work. I just want to bang on the drum all day.';

How it is possible to read the string to the s1 including another quote at don''t

CamboSlice on 10 Jul 2019

including lower() helped me with the capital I

Solution 1405293

1 Comment

1 Comment

Thiago César on 5 Jan 2018

'Y' is being considered as a consonant!

Solution 1111300

3 Comments

3 Comments

Chaz Bowen on 27 Jan 2017

In addition to vowels, the second test also removes a space. While it's natural to want to clean up extra spaces, spaces are _not_ vowels.

Stephen Cohen on 23 Jun 2017

The display of the test suite show the second space at the "I" being removed, but the actual test does not remove it. This is very confusing, but the test actually works as you would expect. It is just that the displayed "correct" answer is - in fact - not correct as you noted.

I had trouble with this as I saw your answer and accommodated their "error" in my solution. Except their error was only a display error and not an actual error in the test suite. Doh!

Stephen Cohen on 23 Jun 2017

See https://www.mathworks.com/matlabcentral/cody/problems/22-remove-the-vowels/solutions/1218453 for a repaired version of your solution.

Of course I just noted that your solution is five months old, so you certainly won't care by now. C'est la vie.

Solution 893867

1 Comment

1 Comment

Dennis Winston on 23 May 2016

Also should include other capitals

Solution 502320

3 Comments

3 Comments

Mike on 17 Sep 2014

Anyone can see why this is not working? Works fine on my side.

Jan Orwat on 18 Sep 2014

Consider letter 'y'. It can be consonant or vowel, depend on context. More: http://en.wikipedia.org/wiki/Consonant#Letters

Mike on 18 Sep 2014

Initially I tried both ways with same results. My mistake was forgetting about the capital vowels. Thanks for the reply Jan.

Solution 448294

1 Comment

1 Comment

Da Lu on 7 Feb 2018

very good solution!

Solution 437579

1 Comment

1 Comment

Returaj Burnwal on 4 May 2014

can any one say what is the problem if we approch through ascii representation?

Solution 225217

1 Comment

1 Comment

bainhome on 29 Mar 2013

excellent example!
one "'" can make a very different situation between "regexp" and "regexpi".

Solution 174048

1 Comment

1 Comment

Marlies on 6 Dec 2012

For the second test-case, something is wrong.

* If you use the string that is given in S1 in MATLAB, you do NOT get the output that is listed.
* However, to get the output that is listed as the correct one, you cannot have the input that is given.

Solution 170581

1 Comment

1 Comment

Martin on 29 Nov 2012

Regexp is apparently unable to detect the 'y' at the end of 'day'. This does not happen on my own computer. Very strange indeed.

Solution 106625

1 Comment

1 Comment

Daniel Pereira on 15 Apr 2013

Smaller but less explicit than 'ignorecase'. Anyway, good solution.

Solution 23665

1 Comment

1 Comment

Giuseppe Cardillo on 1 Feb 2012

On my pc it works. Why not here?

Solution 1538

2 Comments

2 Comments

Tom on 11 Feb 2012

Wait... how is this:

s2 = regexprep(s1,'[aeiouAEIOU]','');

shorter than this?

s2 = s1(regexpi(s1,'[^aeiou]'));

Ben Ausdenmoore on 15 Apr 2012

@Tom
I believe it is because the regexpi would be the same as including the 'ignorecase' option from regexprep command (including that makes the size 15).

Solution 276

2 Comments

2 Comments

Pavel on 12 Apr 2012

Does it really matter if y is a vowel or not? XD

shahin rmz on 5 Nov 2016

y or y not!!
thats the problem...

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Problem 22. Remove the vowels

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