Problem 838. Check if number exists in vector

Created byNichlas

Like (41)

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年代olution Stats

16273 Solutions
7428 Solvers

Last年代olutionsubmitted on Jul 12, 2022

Last 200 Solutions

Problem Comments

7 Comments

7 Comments

年代how 4 older comments

Richard Zaporon 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 mcnallyon 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 Chintalaon 21 Apr 2020

good

Nicholas Bitleron 26 Nov 2020

that was fun, took me a couple minutes

Qingyin Zhangon 29 Nov 2020

y = sum(b == a);

Colin McNicholason 13 Dec 2021

Not too bad

Hung Van Leon 24 Feb 2022

yay

年代olution Comments

年代olution 6810920

1 Comment

1 Comment

Josh Klueberon 2 Nov 2021

good problem

年代olution 5669410

1 Comment

1 Comment

john perkinson 4 May 2021

this took me while good problem!

年代olution 4748072

2 Comments

2 Comments

Michael Greenon 4 Feb 2021

One line :)

Isabella Stellitanoon 3 Nov 2021

GOOD

年代olution 4143245

1 Comment

1 Comment

Cory Cunninghamon 11 Dec 2020

I finally got it!

年代olution 3602815

2 Comments

2 Comments

年代wati Sarangion 10 Nov 2020

Can anyone tell me what's wrong in this code as I am getting the desired result in my laptop?

function y = existsInVector(a,b)
for i=1:length(b)
if a==b(i)
y=1
elseif
i=i+1
if i==3
y=0
end
end
end
end

arsenic 陈on 11 Mar 2021

u have finished just theexample
function y = existsInVector(a,b)
y=1-isempty(find(a==b));
end

年代olution 3277703

1 Comment

1 Comment

Joseph Martel-Foleyon 19 Oct 2020

Add a test for multiple matches in the vector.

年代olution 3205066

年代olution 3064189

年代olution 2905837

1 Comment

1 Comment

Peter Jan Struivingon 31 Mar 2021

Leading solutions are still broken

年代olution 2586241

1 Comment

1 Comment

Piero Cimuleon 19 Jun 2020

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

年代olution 1936828

年代olution 1173654

1 Comment

1 Comment

Ernest Woeion 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

年代olution 899430

1 Comment

1 Comment

Joe Smithon 31 May 2016

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

年代olution 113925

1 Comment

1 Comment

Nichlason 17 Jul 2012

Thanks! Have updated tests.

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