Check whether the input matrix is a figurate number triangle: http://mathworld.wolfram.com/FigurateNumberTriangle.html
you should probably add a test case where the correct answer is false.
I added a few more tests as suggested.
Find the sum of all the numbers of the input vector
does it touch ?
Output any real number that is neither positive nor negative
Number of digits in an integer
Add two numbers
Increment a number, given its digits
Are you in or are you out?
Maintain shape of logical-index mask
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