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.
Magic is simple (for beginners)
select the primes of a vector
07 - Common functions and indexing 5
Find the Nth Root of a Given Number
Max of a Vector
Matlab Basics - Switching Assignments
Matlab Basics - Logical Tests I
Matlab Basics II - Minimum
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics II - Intervals
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