Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!apple!gem.mps.ohio-state.edu!samsung!ginosko!cg-atla!kincaid
From: kincaid@cg-atla.UUCP (Tom Kincaid )
Newsgroups: comp.lang.postscript
Subject: Novice Question
Keywords: Help
Message-ID: <7834@cg-atla.UUCP>
Date: 27 Oct 89 17:43:04 GMT
Distribution: comp
Organization: Agfa Compugraphic Division, Wilmington, Mass. USA
Lines: 25



Problem:	I am exporting postscript to another program. My code
		evaluates a Postscript variable "V1" that under
		certain conditions is defined by the importing program
		and under other conditions is not.

		So sometimes I get the error:
		
		" V1 undefined " 

		from the interpreter.


Is there a way to:  

		-Check to see if V1 is defined 

		-if it is defined, do nothing.

		-if it is not defined, then define it.


		Thanks,
				Tom