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.
Matrix indexing with two vectors of indices
Sum the numbers on the main diagonal
Returning a "greater than" vector
Length of a short side
Find the product of a Vector
Matlab Basics II - Create a vector with a repeated entry
Matlab Basics - Create a row vector
Matlab Basics - Assigning Variables
Matlab Basics II - Extract last 3 elements of a vector
Matlab Basics - Rounding I
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