Problem 838. Check if number exists in vector

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

Last Solution submitted on Nov 29, 2023

Show 4 older 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

Nicholas Bitler on 26 Nov 2020

that was fun, took me a couple minutes

Qingyin Zhang on 29 Nov 2020

y = sum(b == a);

Colin McNicholas on 13 Dec 2021

Not too bad

Hung Van Le on 24 Feb 2022

yay

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