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.
Increment a number, given its digits
Create incrementing array
Integer or Float?
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Matlab Basics II - Operations and Matrix Dimensions
Replace every 3rd element in a vector with 4
Matlab Basics - Rounding I
Matlab Basics II - squares
Matlab Basics II - Create a vector with a repeated entry
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