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MathGroup Archive 2006

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RE: how-to show a contourplot together with a point grid

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72055] RE: [mg72006] how-to show a contourplot together with a point grid
  • From: "David Annetts" <davidannetts at aapt.net.au>
  • Date: Sun, 10 Dec 2006 04:49:02 -0500 (EST)

Hi, 

>     i have a matix of dimension {m,n} and make a 
> listcontourplot out of it. and i have another matrix of the 
> same dimension and make a plot by
> : Show[Map[Point,grid]].
>    i want to overlap these two plots together. And I have 
> tried using the second one as the Epilog of the first one, 
> but it did not work. any ideas?
>    generally, how can i overlap two plots in one figure?
>    thanks for your attentions and reply

It is very difficult to give specific help since you heven't given a
specific example.  In future, I suggest you post the code that you are
having problems with.  

Generate some data, then plot it

	data = Table[Sin[x y], {x, -Pi, Pi, Pi/10}, {y, -Pi, Pi, Pi/10}];
	cplt = ListContourPlot[data, ColorFunction -> Rainbow, MeshRange ->
{{-Pi, Pi}, {-Pi, Pi}},
      	FrameTicks -> {PiScale, PiScale, None, None}];

For the colour function, I define 

	Rainbow[z_] := Hue[.8 z];

You will also need to load Graphics`Graphics for PiScale to work.

Next, generate the points and plot them

	pnts = Table[{x, y}, {x, -Pi, Pi, Pi/10}, {y, -Pi, Pi, Pi/10}];
	pplt = Show[Graphics[Point[#] & /@ Partition[Flatten[pnts], 2]]];

Finally, display the two plots

	Show[cplt, pplt];

Show[] is usually how you'd display two (or more) plots together.

Regards, 

Dave.


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