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.
Filter AC, pass DC
Back to basics 11 - Max Integer
Remove the two elements next to NaN value
Square a Number
Make roundn function
Matlab Basics - Assigning Variables
Matlab Basics II - Minimum
Matlab Basics - Create a row vector
Matlab Basics - Rounding III
Matlab Basics - y as a function of x
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