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MathGroup Archive 2004

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Re: Re: Needed Grid lines in Implicit Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52735] Re: [mg52699] Re: Needed Grid lines in Implicit Plot
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Sat, 11 Dec 2004 05:21:48 -0500 (EST)
  • References: <200412070909.EAA09155@smc.vnet.net><cp42b1$ap1$1@smc.vnet.net> <200412100123.UAA18934@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On 10 Dec 2004, at 10:23, Narasimham wrote:

> Thanking you together.
> But why is it necessary to combine graphics with Show,
> why does not GridLines -> {Range[-4, 4, 1], Range[-4, 4, 1]}
> work directly as one of the plot options?       Regards
>
>
Because ImplicitPlot returns a ContourGraphics object and

Options[ContourGraphics]

{AspectRatio -> 1, Axes -> False, AxesLabel -> None,
   AxesOrigin -> Automatic, AxesStyle -> Automatic,
   Background -> Automatic, ColorFunction -> Automatic,
   ColorFunctionScaling -> True, ColorOutput -> Automatic,
   ContourLines -> True, Contours -> 10,
   ContourShading -> True, ContourSmoothing -> True,
   ContourStyle -> Automatic, DefaultColor -> Automatic,
   DefaultFont :> $DefaultFont, DisplayFunction :>
    $DisplayFunction, Epilog -> {},
   FormatType :> $FormatType, Frame -> True,
   FrameLabel -> None, FrameStyle -> Automatic,
   FrameTicks -> Automatic, ImageSize -> Automatic,
   MeshRange -> Automatic, PlotLabel -> None,
   PlotRange -> Automatic, PlotRegion -> Automatic,
   Prolog -> {}, RotateLabel -> True,
   TextStyle :> $TextStyle, Ticks -> Automatic}


does not contain GridLines. Why not? Well presumably because this would 
interfere with the main purpose of ContourGraphics and make pictures 
less clear. In any case, you can always convert a ContourGraphics 
object to a graphics object and use the options of Graphics.



Andrzej Kozlowski
Chiba, Japan
http://www.akikoz.net/~andrzej/
http://www.mimuw.edu.pl/~akoz/


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