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.
Make a random, non-repeating vector.
Generate a random matrix A of (1,-1)
Sum of the Matrix Elements
Matlab Basics II - squares
Matlab Basics - Create a row vector
Matlab Basics II - Free Fall
Matlab Basics - Pick out parts of a vector
Matlab Basics II - Log and natural log
Matlab Basics II - Velocity of a particle
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