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

Solution 3289533

Submitted on 20 Oct 2020
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### Test Suite

Test Status Code Input and Output
1   Fail
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))

Out of memory. Error in isTriangleNumber (line 3) s = cumsum(1:n); Error in Test1 (line 4) assert(isequal(isTriangleNumber(x),y_correct))

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

Out of memory. Error in isTriangleNumber (line 3) s = cumsum(1:n); Error in Test2 (line 3) assert(isequal(isTriangleNumber(x),y_correct))

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

Out of memory. Error in isTriangleNumber (line 3) s = cumsum(1:n); Error in Test3 (line 3) assert(isequal(isTriangleNumber(x),y_correct))

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