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 Apr 25, 2025

Show 6 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

Aman Yadav on 31 Mar 2024

fggga

MOHAMMAD SAMEER on 22 May 2024

As difference in solution directly proportional to size of solution

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