Re: Basic conditional statement question.
- To: mathgroup at smc.vnet.net
- Subject: [mg48669] Re: Basic conditional statement question.
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 10 Jun 2004 02:43:03 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <email@example.com>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, If[ValueQ[a] && a != 0, Print["such and such"]] Regards Jens Scott wrote: > > Here is a question I would think has a simple solution. Let's say I > have some variable "a" which is an integer, but I haven't defined it > in Mathematica. I want to run a conditional statement on it. > Basically > > If[a!=0,Print["such and such"]] > > When I do something like this, Mathematica I asume is spitting out a > null statement, because it doesn't do anything. So, how can I define > "a" such that Mathematica knows it isn't =0 yet, still some integer. > > The reason I ask is I am calculating Christophel symbols (and such) > and many of them =0, so I want to only output those that are not equal > to zero. > > Thanks for any help, > Scott