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.
Find the largest value in the 3D matrix
Determine the length of a string of characters
Sum of series V
Product of Array
Matlab Basics II - Velocity of a particle
Matlab Basics - Rounding I
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics II - Free Fall
Matlab Basics - Create a row vector
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