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.
Tell me the slope
Back to basics 12 - Input Arguments
sum of non-primes
Return 'on' or 'off'
Switch matrix to a column vector
Matlab Basics II - Find the roots of a function
Matlab Basics - Assigning Variables
Replace every 3rd element in a vector with 4
Matlab Basics - Rounding II
Matlab Basics - Set unwanted parts of a vector to zero
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