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.
Simple equation: Annual salary
Product of elements in row
BASICS - sum part of vector
Change matrix to vector
Matlab Basics II - Velocity of a particle
Matlab Basics - Pick out parts of a vector
Matlab Basics II - squares
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics II - Unit Conversion
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