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.
Find all elements less than 0 or greater than 10 and replace them with NaN
Replace Vector Elements
Count decimal digits of a number
Matlab Basics - Assigning Variables
Matlab Basics II - Free Fall
Replace every 3rd element in a vector with 4
Matlab Basics - y as a function of x
Matlab Basics II - Extract last 3 elements of a vector
Matlab Basics - Absolute Value
Matlab Basics II - Max & Index of Max
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