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.
Make a checkerboard matrix
Find the sum of the elements in the "second" diagonal
Replicate elements in vectors
Deleting an element in a matrix
Matlab Basics II - Find the roots of a function
Matlab Basics - Rounding I
Matlab Basics - Pick out parts of a vector
Matlab Basics - Logical Tests I
Matlab Basics II - Extract last 3 elements of a vector
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