Re: Basic conditional statement question.

• To: mathgroup at smc.vnet.net
• Subject: [mg48688] Re: [mg48653] Basic conditional statement question.
• From: DrBob <drbob at bigfoot.com>
• Date: Thu, 10 Jun 2004 02:44:12 -0400 (EDT)
• References: <200406090817.EAA15671@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Either of these will work for you, I think:

If[a == 0, Null, Print["such and such"], Print["such and such"]]
"such and such"

If[ !TrueQ[a == 0], Print["such and such"]]
"such and such"

Bobby

On Wed, 9 Jun 2004 04:17:30 -0400 (EDT), Scott <jujio77 at yahoo.com> 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
>
>

--
DrBob at bigfoot.com
www.eclecticdreams.net/index.html

```

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