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.
Output any real number that is neither positive nor negative
2倍してみよう - ここからスタート！
Convert given decimal number to binary number.
Vectors counting by 2
Matlab Basics II - squares
Replace every 3rd element in a vector with 4
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics - Rounding III
Matlab Basics II - Intervals
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