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.
Remove any row in which a NaN appears
Omit columns averages from a matrix
Convert a vector into a number
Symmetry of vector
Matlab Basics - Create a row vector
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics - Logical Tests I
Matlab Basics II - squares
Matlab Basics II - Create a vector with a repeated entry
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