[R] (offtopic) I need two sets of 5 different color scales

Uwe Ligges ligges at statistik.uni-dortmund.de
Sat Apr 10 14:55:25 CEST 2004

Tamas Papp wrote:
> Hi,
> I am plotting a policy function (result from a dynamic stochastic
> optimization problem, discretized approximation).  The policy function
> maps from an 2 x 2 x 2 x 3 x B x F state space to a B x F state space
> (B and F are usually between 4-6, and represent domestic and foreign
> savings.  The other variables are income (Y), inflation (Pi), domestic
> and foreign interest rates (R and Z)).  I actually wrote a plotting
> function to represent all this, the result is attached -- please have
> a look at it and help me...
> I need advice in the following: I need two sets of colors for B and F
> which are easy to distinguish (when printed on a color laser printer),
> represent cardinality (ie have an intuitive mapping to an interval) or
> at least ordinality.
> I have experimented with the following:
> Bcolors <- hsv(.6, seq(0.2, 1, length=5), 1)
> Fcolors <- hsv(seq(.1,0, length=5), seq(0.2, 1, length=5)
> this is what you see in the plot.  What colors would you use?  Do you
> think that varying both brightness and hue helps to distinguish
> colors?  Should I change saturation, too?

Hmm, Ross Ihaka has given a talk at the DSC2003 conference about 
constructing sensible colors. Unfortunately, there is no paper available 
at http://www.ci.tuwien.ac.at/Conferences/DSC-2003/Proceedings/ ...
Some notes and a color package are available at 

Also, you might want to look at the package RColorBrewer available at 
CRAN. The package is supposed to provide palettes of sensible colors.

Uwe Ligges

PS: If you want to send any attachments: Preferably upload to a web site 
and just post the link.

> Thanks,
> Tamas
> PS.: The plot is simply gzipped.  If you need a zipped version, or the
> source code, contact me.
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