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.
Add a row of zeros on top of a matrix
Integer or Float?
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics - Absolute Value
Matlab Basics - Create a row vector
Matlab Basics - Assigning Variables
Matlab Basics II - Unit Conversion
Matlab Basics - y as a function of x
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