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 the vector [1 2 3 4 5 6 7 8 9 10]
Inner product of two vectors
Flip the vector from right to left
Array of Ones
Matlab Basics II - Intervals
Matlab Basics - Pick out parts of a vector
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics - Rounding I
Matlab Basics - Set unwanted parts of a vector to zero
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