Problem 139. Determine if a Given Number is a Triangle Number

Created by @bmtran (Bryant Tran)

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Description:

Determine if the elements of an input array are triangle numbers and return the result as an array with the same dimensions as the input.

Example:

    Input  = [ 1 2 3 ];
    Output = [ 1 0 1 ];

Solve

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1020 Solutions
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Last Solution submitted on Jun 25, 2020

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Solution 2003102

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Bob Lin on 5 Nov 2019

Watch out! Martix size!

Solution 1102049

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2 Comments

Lucinda King on 11 Jan 2017

This works in Matlab but not here? It fails on Test 3, but when I use the same value of x and the same function in Matlab it works...

Jan Orwat on 13 Jan 2017

Your output y is a row vector (or scalar), but in 3'rd test it should be a column vector. Predefine y first with the same size as x.

Solution 549639

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1 Comment

Ramoflaple on 10 Jul 2015

good solution

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triangle numbers

Problem 139. Determine if a Given Number is a Triangle Number

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Problem 139. Determine if a Given Number is a Triangle Number

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Last 200 Solutions

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Problem Recent Solvers362

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