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 the sum of all the numbers of the input vector
Create a vector whose elements depend on the previous element
matrix of natural number
Matlab Basics II - Max & Index of Max
Matlab Basics - Absolute Value
Matlab Basics II - Velocity of a particle
Matlab Basics - Convert a row vector to a column vector
Matlab Basics - Assigning Variables
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