If I were to type this in to MATLAB right now, it absolutely would create the desired vector. I don't think I understand Cody.
Cody requires you to define a function, so you have to precede this statement by an appropriate function statement.
Determine if a Given Number is a Triangle Number
High school cafeteria
First non-zero element in each column
Determine Whether an array is empty
Remove any row in which a NaN appears
Find the peak 3n+1 sequence value
Extract leading non-zero digit
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