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
Sum of diagonal of a square matrix
Rotate a Matrix
Create matrix of replicated elements
Generate a NaN...on purpose
Matlab Basics - Rounding I
Matlab Basics - Create a row vector
Replace every 3rd element in a vector with 4
Matlab Basics II - Velocity of a particle
Matlab Basics - Convert a row vector to a column vector
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