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.
Solve the set of simultaneous linear equations
Multiply 2 numbers
Replace every 3rd element in a vector with 4
factorial of a number x
Square root of a number
Matlab Basics - Logical Tests I
Matlab Basics II - Minimum
Matlab Basics II - Operations and Matrix Dimensions
Matlab Basics II - Extract last 3 elements of a vector
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