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

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

Last solution submitted on Oct 17, 2019

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.

Ramoflaple on 10 Jul 2015

good solution

triangle numbers