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.
Convert a vector into a number
Output any real number that is neither positive nor negative
length of a vector
Square a Number
Matlab Basics - Absolute Value
Matlab Basics - Pick out parts of a vector
Matlab Basics II - Extract last 3 elements of a vector
Matlab Basics II - Find the roots of a function
Matlab Basics - Switching Assignments
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