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.
Arrange Vector in descending order
Get the length of a given vector
02 - Vector Variables 1
Matlab Basics - Logical Tests I
Matlab Basics - Assigning Variables
Matlab Basics II - Log and natural log
Matlab Basics II - Velocity of a particle
Replace every 3rd element in a vector with 4
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