R help - Nov 2009 - fixed color scale for a series of contour plots

Hello,
I am having trouble figuring out how to create a color scale that will  
be consistent across multiple contour plots. What I would like is to  
plot a series of contour or image plots for different subsets of a  
data set but make sure that the color key stays fixed so that the  
plots are easily comparable. That is I need a map from the range of  
values of the entire data set to the color scale and keep then use  
this color scale for all plots + be able to display the color bar as a  
legend next to the plot. This sounds trivial, but I can't find useful  
hints in the documentation of the color arguments of the different  
plots.
Thanks so much for any help
Best
Marion

You don't tell us which function you use, but fixing the zlim argument
in image or related functions should do the trick.
M.
> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Marion Dumas
> Sent: Dienstag, 3. November 2009 14:38
> To: r-help at r-project.org
> Subject: [R] fixed color scale for a series of contour plots
> 
> Hello,
> I am having trouble figuring out how to create a color scale 
> that will be consistent across multiple contour plots. What I 
> would like is to plot a series of contour or image plots for 
> different subsets of a data set but make sure that the color 
> key stays fixed so that the plots are easily comparable. That 
> is I need a map from the range of values of the entire data 
> set to the color scale and keep then use this color scale for 
> all plots + be able to display the color bar as a legend next 
> to the plot. This sounds trivial, but I can't find useful 
> hints in the documentation of the color arguments of the 
> different plots.
> Thanks so much for any help
> Best
> Marion
> 
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