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MathGroup Archive 1997

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Re: Combining graphics objects

  • To: mathgroup at smc.vnet.net
  • Subject: [mg7744] Re: Combining graphics objects
  • From: gah <gah at math.umd.edu>
  • Date: Mon, 7 Jul 1997 04:41:18 -0400
  • Organization: University of Maryland, College Park
  • Sender: owner-wri-mathgroup at wolfram.com

Joel Bock wrote:
> 
> Hello Mathematica Addicts:
> 
> I'm trying to do something ostensibly very simple in Mathematica 3.0.
> I want to create a scatterplot with different symbols representing various
> quantities of interest.  On top of this, I'd like to overlay some straight
> lines indicating boundaries delimiting regions of 2D space with distinct
> probabilities of occurrence.  I have tried to combine "MultipleListPlot"
> with "Line" graphics primitives, with no success.  For example:
> 
> line1 = Line[{0,1.75},{4.667,0}];
> 
> plt1 = MultipleListPlot[y1,y2,y3,
>         Frame->True,
>         FrameLabel->{"ylabel","xlabel"},
>         AxesOrigin->{0,0},
>         PlotRange->{0,2.5},
>         PlotLabel->"label",
>             SymbolShape->{PlotSymbol[Box],PlotSymbol[Triangle],PlotSymbol[Di
> amond]},
>         TextStyle->{FontFamily->"Helvetica",
>         FontSize->10}
> ];
> 
> Show[plt1,line1];
> 
> I'm getting an error after the "Show" call that says
> Show::"gcomb":
>     "An error was encountered in combining the graphics objects in
> Show[-Graphics-, Line[{x1,y1},{x2,y2}}]"
> 
> Can anyone help decipher this problem?  Thanks!!

Show only combines Graphics objects and Line[...] is not yet a Graphics
object. You need to wrap Graphics around it.

    Show[plt1,Graphics[{line1}]];

--Garry Helzer


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