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
Getting logical indexes
Area of an Isoceles Triangle
Find out sum of prime number till given number
Matlab Basics II - Create a vector with a repeated entry
Matlab Basics II - Velocity of a particle
Matlab Basics II - Log and natural log
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics - y as a function of x
Matlab Basics II - Free Fall
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