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". -- To reply via email subtract one hundred and four