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I am trying to make a contour plot of a gravitational potential, consisting of a sum og different potential.s.

I would like to plot them separately with a BarLegend that has the same colors for the same values of the potential. What I got now is that the colors in the two plots does not represent the same potential energy. Here's an example:

contplotb = 
  ContourPlot[1/Sqrt[R^2 + z^2 + 1], {R, 0, 10}, {z, -10, 10}, 
  PlotRange -> All,
  PlotLegends -> BarLegend[Automatic, All, LegendFunction -> "Panel"]]

 contplotd = 
  ContourPlot[3/Sqrt[R^2 + z^2 + 1], {R, 0, 10}, {z, -10, 10}, 
   PlotRange -> All,
   PlotLegends -> BarLegend[Automatic, All, LegendFunction -> "Panel"]]

As you may see, the colors represent different values, but it would be nice to have them represent the same

Any tips are much apreciated, and please include code if you have a solution, I'm very new to Mathematica.

Thanks Espen

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  • $\begingroup$ closely related Q/As: Scale coloring of ContourPlot and Set the same color scale across multiple ListContourPlots $\endgroup$
    – kglr
    Commented Apr 13, 2015 at 19:03
  • 1
    $\begingroup$ Use ColorFunction -> ColorData[{"Rainbow", {0, 3}}], ColorFunctionScaling -> False on both plots $\endgroup$
    – Dr. belisarius
    Commented Apr 13, 2015 at 19:44
  • $\begingroup$ Thank you, guys! I checked out those other posts, but they seemed a bit more advanced than what I was after. Belisarius' answer worked just as I was hoping for. $\endgroup$
    – Espen Brun
    Commented Apr 14, 2015 at 6:46
  • $\begingroup$ @belisarius Answer, or Close? $\endgroup$
    – Mr.Wizard
    Commented May 23, 2015 at 13:41

1 Answer 1

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Since Belisarius answered this in comments, this is just so people know that it has been dealt with.

Use 

ColorFunction -> ColorData[{"Rainbow", {0, 3}}], ColorFunctionScaling -> False

for each plot.

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