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.
Select every other element of a vector
Get the length of a given vector
Calculate the area of a triangle between three points
Simple equation: Annual salary
Matlab Basics II - squares
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics II - Intervals
Matlab Basics - y as a function of x
Matlab Basics II - Unit Conversion
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