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.
Project Euler: Problem 2, Sum of even Fibonacci
Rotate a Matrix
Divide by 4
Divisible by 2
Matlab Basics - y as a function of x
Matlab Basics II - Minimum
Matlab Basics - Rounding I
Matlab Basics II - Free Fall
Matlab Basics II - Log and natural log
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