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.
Back to basics 9 - Indexed References
06 - Matrix Equations 2
Remove the positive integers.
Matlab Basics - y as a function of x
Matlab Basics II - Log and natural log
Replace every 3rd element in a vector with 4
Matlab Basics - Convert a row vector to a column vector
Matlab Basics - Logical Tests I
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