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.
Determine whether a vector is monotonically increasing
Equal to their cube
Matlab Basics - Rounding III
Matlab Basics - Logical Tests I
Matlab Basics II - Intervals
Matlab Basics II - squares
Matlab Basics - Rounding II
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