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 8 - Matrix Diagonals
Given area find sides
Area of a Square
Cumulative product of a vector
Rotate Matrix @180 degree
Matlab Basics II - Count rows in a matrix
Matlab Basics II - Velocity of a particle
Matlab Basics II - Log and natural log
Matlab Basics - Assigning Variables
Replace every 3rd element in a vector with 4
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