[Date Index] [Thread Index] [Author Index]

Re: Null entry in a Graphics list?

• To: mathgroup at smc.vnet.net
• Subject: [mg51814] Re: Null entry in a Graphics list?
• From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
• Date: Wed, 3 Nov 2004 01:23:29 -0500 (EST)
• Organization: Uni Leipzig
• References: <cm7chn$lea$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

and the rule NoGraphics :> Sequence[]
does not work ?

Regards
  Jens

"AES/newspost" <siegman at stanford.edu> schrieb im Newsbeitrag 
news:cm7chn$lea$1 at smc.vnet.net...
> Is there a "Null" or a "None" for Graphics?
>
> If I want to accomplish something like
>
>    g1 = Graphics[---];
>    g2 = Graphics[---]
>    g3 = If[test, Graphics[---], NoGraphics ];
>
>    Show[g1, g2, g3 ];
>
> is there something I can put in for "NoGraphics" (other than an
> offscreen Point or a zero-size Point or . . . ) that will be acceptable
> in subsequent graphics commands
>