From a usability point of view, returning a string to indicate nothing found is probably the worst. an empty value or 0 would be much better.
Guillaume, I would say that that depends upon the intended 'audience' for the output.
Equal to their cube
y equals x divided by 2
Multiply by 3
Matlab Basics II - Minimum
Matlab Basics II - Count rows in a matrix
Matlab Basics II - Operations and Matrix Dimensions
Matlab Basics - Rounding II
Matlab Basics II - Intervals
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