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Re: Basic conditional statement question.
*To*: mathgroup at smc.vnet.net
*Subject*: [mg48697] Re: Basic conditional statement question.
*From*: Bill Rowe <readnewsciv at earthlink.net>
*Date*: Thu, 10 Jun 2004 02:44:54 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
On 6/9/04 at 4:17 AM, jujio77 at yahoo.com (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"]]
If "a" hasn't been defined then Head[a]==Symbol ought to evaluate as True
>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.
Now you seem to be asking a different question. If "a" is known to be an integer it must have an assigned value. Or do you mean you *intend* for "a" to be assigned integer values at some later time? If this is the case, there is no test in Mathematica that can determine your *intention* to assign some value later to "a".
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