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.
Summing Digits within Text
Back to basics 21 - Matrix replicating
Returning a "greater than" vector
Matlab Basics II - squares
Matlab Basics II - Operations and Matrix Dimensions
Matlab Basics - Assigning Variables
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics II - Create a vector with a repeated entry
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