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 19 - character types
What number has this problem?
length of a vector
Evaluating a polynomial
Square root of a number
Matlab Basics - Create a row vector
Matlab Basics - Assigning Variables
Matlab Basics II - Unit Conversion
Matlab Basics - Convert a row vector to a column vector
Matlab Basics II - Intervals
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