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.
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Cell Counting: How Many Draws?
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Matlab Basics II - Intervals
Matlab Basics - Rounding II
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics - Absolute Value
Matlab Basics II - Velocity of a particle
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