if you're going to post trivial problems that have already been posted before, at least use a proper test suite.
and this one does not even require a solution
Back to basics 7 - Equal NaNs
Get the length of a given vector
Add two numbers
Volume of a box
Matlab Basics II - Count rows in a matrix
Matlab Basics - Logical Tests I
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics II - Free Fall
Matlab Basics II - Operations and Matrix Dimensions
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