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.
Whether the input is vector?
Make a 1 hot vector
Add two numbers
Is this triangle right-angled?
Flip the vector from right to left
Matlab Basics - Rounding II
Matlab Basics II - Operations and Matrix Dimensions
Matlab Basics - Logical Tests I
Matlab Basics - Convert a row vector to a column vector
Matlab Basics II - Create a vector with a repeated entry
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