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.
Maximum value in a matrix
Perfect Square or not
Append two matrix as shown below example
Flip the vector from right to left
Matlab Basics II - Intervals
Matlab Basics - Rounding II
Matlab Basics - Rounding I
Matlab Basics II - Unit Conversion
Matlab Basics - Switching Assignments
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