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.
Celsius to Fahrenheit converter
Sum the numbers on the main diagonal
The sum of the numbers in the vector
07 - Common functions and indexing 2
Matlab Basics II - Create a vector with a repeated entry
Matlab Basics - Absolute Value
Matlab Basics II - Operations and Matrix Dimensions
Matlab Basics - Assigning Variables
Matlab Basics II - Free Fall
Matlab Basics - Rounding II
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