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.
Swap the first and last columns
Increment a number, given its digits
All your base are belong to us
select the primes of a vector
Matlab Basics - Convert a row vector to a column vector
Matlab Basics II - Max & Index of Max
Replace every 3rd element in a vector with 4
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics - Rounding II
Matlab Basics II - Extract last 3 elements of a vector
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