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.
Indexed Probability Table
Rotate a Matrix
Test if two numbers have the same digits
Fahrenheit to Celsius converter
Finding perimeter of a rectangle
Matlab Basics II - Minimum
Matlab Basics II - Extract last 3 elements of a vector
Matlab Basics - Create a row vector
Matlab Basics - y as a function of x
Replace every 3rd element in a vector with 4
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