herladygeekedness (8/2/2012)
Not talking about the result, talking about the length argument.I created a simple expression using -2 as length and was unable to save the expression due to "length cannot accept negative number" (okay, not a direct quote, but teh error was specific and when I changed length to positive number, no issues).
??
The expression I quoted was only the length argument - from the OP's example.
If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.