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.
Return a list sorted by number of occurrences
Tell me the slope
Back to basics 19 - character types
Output any real number that is neither positive nor negative
Do Fast Fourier Transformation
Matlab Basics - Convert a row vector to a column vector
Matlab Basics - y as a function of x
Matlab Basics II - Minimum
Matlab Basics II - Create a vector with a repeated entry
Matlab Basics II - Velocity of a particle
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