Problem 838. Check if number exists in vector

Created by Nichlas

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>Return 1 if number</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>a</w:t></w:r><w:r><w:t> exists in vector</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:i/></w:rPr><w:t>b</w:t></w:r><w:r><w:t> otherwise return 0.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[a = 3;\nb = [1,2,4];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Returns 0.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[a = 3;\nb = [1,2,3];]]></w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Returns 1.</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

9069 Solutions
3719 Solvers

Last Solution submitted on Oct 29, 2020

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

Richard Zapor on 17 Jul 2012

Add test vector a = -12;
b = [1,3,4,5,6,7,8,-12,2]; and rescore.
Better is add a=-randi(16); b= [1 2 3 a];
These will eliminate answers like #6.

frank mcnally on 15 Aug 2019

Tests allow incorrect solution to pass:

function y = existsInVector(a,b)
y=0
for i = 1:numel(b);
if i==a
y=1
break
end
end
end

Jyothsna Chintala on 21 Apr 2020

good

Solution Comments

Solution 3277703

1 Comment

1 Comment

Joseph Martel-Foley on 19 Oct 2020 at 13:23

Add a test for multiple matches in the vector.

Solution 3205066

1 Comment

1 Comment

Muhammad Akmal Afibuddin Putra on 14 Oct 2020 at 9:48

use ismember(a,b)

Solution 3064189

1 Comment

1 Comment

Teja Abdullah Al-Mujahid on 5 Oct 2020 at 4:01

y = ~isempty(b(b == a))

Solution 2586241

1 Comment

1 Comment

Piero Cimule on 19 Jun 2020

if true(find(b == a))
y = 1
else
y = 0
end

Solution 1936828

1 Comment

1 Comment

Umur Ulas Harman on 25 Jun 2020

function y = existsInVector(a,b)
y = ismember(a,b)
end

Solution 1173654

1 Comment

1 Comment

Ernest Woei on 27 Apr 2017

While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore.

function y = existsInVector(a,b)
y=ismember(a,b);
end

Solution 899430

1 Comment

1 Comment

Joe Smith on 31 May 2016

There is a pre-made function for this.
y = ismember(a,b)

Solution 113925

1 Comment

1 Comment

Nichlas on 17 Jul 2012

Thanks! Have updated tests.

Problem Recent Solvers3719

Problem Tags

basic matlab vectors

Community Treasure Hunt

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

Start Hunting!