Problem 44. Trimming Spaces

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 string, remove all leading and trailing spaces (where space is defined as ASCII 32).</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ Input  a = ' singular value decomposition  '\n Output b is 'singular value decomposition']]></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

5535 Solutions
1792 Solvers

Last Solution submitted on May 14, 2022

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

Franck Dernoncourt on 28 Jan 2012

Test #5 seems false:
I guess "a = sprintf('\ttab in front, space at end ');" should be a = '\ttab in front, space at end '.
Besides, tab is ASCII 9 (not 32).

Selvaraaju Murugesan on 15 Jan 2013

@Franck..use isspace function. There is a difference between whitespace and tab space! BTW strtrim removes both white and tab space !

Sanzhar Askaruly on 3 Jul 2019

pretty easy

Rik on 13 Jan 2021

This problem should probably contain a test with only spaces as well. That requires solutions to be much more robust.

Solution Comments

Solution 1717598

1 Comment

1 Comment

Carlos Castillo on 30 Jan 2019

Isn't the use of regexp or regexprep supposed to be limited? It's not that I dislike using it, it's just that these string problems seem to be becoming a regexprep practice.

Solution 1431247

1 Comment

1 Comment

Chuck Saunders on 1 Feb 2018

There's no test case with multiple spaces in the middle. I had considered strjoin(strsplit), which would pass all the tests here if you removed empty cells from the strsplit operation, but it would reduce multiple spaces in the middle to one.

Solution 1286255

1 Comment

1 Comment

Allen on 13 Oct 2017

I am sure that there is a more efficient way to perform this operation with just regexp, but the intricacies of this wonderful function still elude me.

Solution 1250630

1 Comment

1 Comment

Ionut Barbu on 14 Aug 2017

works if you have MATLAB >= 2016b

Solution 1117194

1 Comment

1 Comment

Gökhan Ayar on 7 Feb 2017

i do not understand what the solution of test 5 should be, or why my solution is wrong

Solution 793818

1 Comment

1 Comment

Fatpuss on 14 Dec 2015

One line

Solution 678841

1 Comment

1 Comment

Varoujan on 2 Jun 2015

Keeps failing test 5 because pretty much all Matlab functions treat \t as space. Tried strtrim(a), isspace(a(i)) = 1, textscan(a,'%s').
The only thing that picks it up is isequal(a(1),' ') = 0. So, only brute force loop can pass test 5.
Not worth the effort.

Solution 678838

1 Comment

1 Comment

Varoujan on 2 Jun 2015

Test case 5 is failing for strtrim(str) or isspace(str) functions - both consider \t as space.

Solution 449769

2 Comments

2 Comments

Richard on 4 Jun 2014

Would fail for double spaces within string

Sebastian on 8 Sep 2015

Check out the "anchor" expressions $ and ^.

Solution 290645

1 Comment

1 Comment

Jon on 4 Dec 2013

How is this able to pass test 5? It should remove the leading tab and fail.

Solution 28990

1 Comment

1 Comment

Trung Duong on 4 Feb 2012

check the test 5????

Problem Recent Solvers1792

Problem Tags

strings whitespace

Community Treasure Hunt

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

Start Hunting!

Problem 44. Trimming Spaces

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1792

Suggested Problems

More from this Author95

Problem Tags

Community Treasure Hunt

Problem 44. Trimming Spaces

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers1792

Suggested Problems

More from this Author95

Problem Tags

Community Treasure Hunt

Players