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MathGroup Archive 2004

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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
> 
> 


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