[Newbie] Interpreting output

*To*: mathgroup at smc.vnet.net*Subject*: [mg56642] [Newbie] Interpreting output*From*: "MC" <daemmerung at enttaeuschung.com>*Date*: Sun, 1 May 2005 00:46:43 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hi everybody.... I'm having troubles in interpreting the output of Mathematica. My problem is to define a function F(x,y,z) such that: F = (whatever) if x>c F=(whatever) if x<=c I achievied this using /; When I derive F with respect to one of the variables, the result is a mess. Just an example with 1 variable: f=x/;x>0; f=-x^2/;x<0; D[f,x]=-2Condition(1,0)[x^2,x<0]+Condition(1,0)[x^2,x<0]Less(1,0)[x,0] Even in this very simple case, the result is a real mess: I really do not know how should I read that...and I'm wondering if I have defined the function in the right way. Anybody so kind to explain me what's goung on? Thank you very much for your patience

**Follow-Ups**:**Re: [Newbie] Interpreting output***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: [Newbie] Interpreting output***From:*Chris Chiasson <chris.chiasson@gmail.com>