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

Solution 1102049

Submitted on 11 Jan 2017

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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.

Test	Status	Code Input and Output
1	Pass	x = 1:100; y_correct = false(1,100); y_correct([1 3 6 10 15 21 28 36 45 55 66 78 91]) = true; assert(isequal(isTriangleNumber(x),y_correct))
2	Pass	x = 1; y_correct = true; assert(isequal(isTriangleNumber(x),y_correct))
3	Fail	x = [4912734125;4912734126]; y_correct = [false;true]; assert(isequal(isTriangleNumber(x),y_correct)) Assertion failed.

Test

Status

Code Input and Output

Pass

x = 1:100; y_correct = false(1,100); y_correct([1 3 6 10 15 21 28 36 45 55 66 78 91]) = true; assert(isequal(isTriangleNumber(x),y_correct))

Pass

x = 1; y_correct = true; assert(isequal(isTriangleNumber(x),y_correct))

Fail

x = [4912734125;4912734126]; y_correct = [false;true]; assert(isequal(isTriangleNumber(x),y_correct))

Assertion failed.