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.
Add two numbers
Determine the square root
Perfect Square or not
Replace values under a limit
Matlab Basics II - Unit Conversion
Matlab Basics II - Minimum
Matlab Basics - Switching Assignments
Matlab Basics - Rounding II
Replace every 3rd element in a vector with 4
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