Re: Basic conditional statement question.
- To: mathgroup at smc.vnet.net
- Subject: [mg48666] Re: [mg48653] Basic conditional statement question.
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 10 Jun 2004 02:42:58 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
a /: a!=0=True; a /: IntegerQ[a]=True; If[a!=0 && IntegerQ[a], Print["such and such"]] such and such Bob Hanlon > > From: jujio77 at yahoo.com (Scott) To: mathgroup at smc.vnet.net > Date: 2004/06/09 Wed AM 04:17:30 EDT > To: mathgroup at smc.vnet.net > Subject: [mg48666] [mg48653] Basic conditional statement question. > > 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 > >