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 alphabetic word product
Bottles of beer
Find the sum of the elements in the "second" diagonal
Create a square matrix of multiples
Matlab Basics - Switching Assignments
Matlab Basics II - Unit Conversion
Matlab Basics II - Find the roots of a function
Matlab Basics II - 3 Dimensional Arrays
Matlab Basics - Create a row vector
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