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  • $\begingroup$ Thank you very much! I learned something new today :D I did not know the ?NumericQ. $\endgroup$ Commented Oct 3, 2015 at 15:28
  • $\begingroup$ In order to make this clear also for other people as me who don't knew this option, see this wolfram post. $\endgroup$ Commented Oct 3, 2015 at 16:35
  • $\begingroup$ and this one for array arguments: mathematica.stackexchange.com/questions/16694/… $\endgroup$ Commented Oct 3, 2015 at 16:50