Problem 838. Check if number exists in vector

Created by Nichlas

Solve Later

Return 1 if number a exists in vector b otherwise return 0.

a = 3;
b = [1,2,4];

Returns 0.

a = 3;
b = [1,2,3];

Returns 1.

Solve

Solution Stats

6001 Solutions
2454 Solvers

Last Solution submitted on Jan 21, 2020

Last 200 Solutions

Problem Comments

2 Comments

2 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

Solution Comments

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 Solvers2454

Problem Tags

basic matlab vectors