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 common elements in matrix rows
Replace NaNs with the number that appears to its left in the row.
Return the Fibonacci Sequence
Basics: 'Find the eigenvalues of given matrix
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics II - Velocity of a particle
Matlab Basics II - Intervals
Matlab Basics II - Free Fall
Matlab Basics - Switching Assignments
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