Cody

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

Solution 145924

Submitted on 9 Oct 2012 by Fumiaki
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### Test Suite

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))

ans = Columns 1 through 10 1 0 1 0 0 1 0 0 0 1 Columns 11 through 20 0 0 0 0 1 0 0 0 0 0 Columns 21 through 30 1 0 0 0 0 0 0 1 0 0 Columns 31 through 40 0 0 0 0 0 1 0 0 0 0 Columns 41 through 50 0 0 0 0 1 0 0 0 0 0 Columns 51 through 60 0 0 0 0 1 0 0 0 0 0 Columns 61 through 70 0 0 0 0 0 1 0 0 0 0 Columns 71 through 80 0 0 0 0 0 0 0 1 0 0 Columns 81 through 90 0 0 0 0 0 0 0 0 0 0 Columns 91 through 100 1 0 0 0 0 0 0 0 0 0

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

ans = 1

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

ans = 0 1