Could you provide an example in your problem statement? Also, as Evan says below, you should have more than one test case or it becomes a trivial matter to hard-code a particular answer.
Probably should add a couple more test cases so that silly people like me don't submit answers like this. ;)
Determine if a Given Number is a Triangle Number
Colon operator of two vectors
Output any real number that is neither positive nor negative
Multiply a column by a row
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