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MathGroup Archive 2004

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Re: Null entry in a Graphics list?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51836] Re: [mg51795] Null entry in a Graphics list?
  • From: DrBob <drbob at bigfoot.com>
  • Date: Wed, 3 Nov 2004 01:24:41 -0500 (EST)
  • References: <200411020705.CAA21665@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

For example:

Needs["Graphics`"]

plotter[f_, overlayPoints_] :=
   DisplayTogether[Plot[f@x, {x, 0, 10}], ReleaseHold@Graphics@{Red, \
PointSize[.03], If[overlayPoints, Table[Point@{x, f@x}, {x, 0,
     10, .5}], HoldForm@Sequence[]]}]
plotter[#Sin[#] &, True]
plotter[#Sin[#] &, False]

or

plotter[f_, overlayPoints_] :=
   DisplayTogether[Plot[f@x, {x, 0, 10}], ReleaseHold@If[
   overlayPoints, Graphics@{Red, PointSize[.03], Table[Point@{x, f@x}, {x, 0,
     10, .5}]}, HoldForm@Sequence[]]]
plotter[#Sin[#] &, True]
plotter[#Sin[#] &, False]

Bobby

On Tue, 2 Nov 2004 02:05:27 -0500 (EST), AES/newspost <siegman at stanford.edu> wrote:

> 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
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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