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.
Determine whether a vector is monotonically increasing
Return elements unique to either input
middleAsColumn: Return all but first and last element as a column vector
Swap two numbers
Matlab Basics - Convert a row vector to a column vector
Matlab Basics II - Minimum
Matlab Basics II - Log and natural log
Matlab Basics II - Operations and Matrix Dimensions
Matlab Basics II - Find the roots of a function
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