[R] customizing the color and point shape for each line drawn using lattice's xyplot

Ross Darnell r.darnell at uq.edu.au
Thu Aug 30 07:56:36 CEST 2007

Does this help

common.without.Method4 <- subset(common, Method!=4)
xyplot(MeanBxg ~ PercentVarExplained | bdg.f * bdx.f,
groups=Method.f, type="l",  auto.key=T)

Ross Darnell

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Gen
Sent: Thursday, 30 August 2007 2:51 PM
To: r-help at stat.math.ethz.ch
Subject: [R] customizing the color and point shape for each line drawn
using lattice's xyplot

Description of what I am trying to do:
I am using the xyplot code below to plot the variable "MeanBxg" against
variable "PercentVarExplained" for all 9 possible combinations of
"bdg" and "bdx".  Within each of these 9 scenarios I am plotting a
line for each of up to 9 different methods that I used to estimate the
variable MeanBxg. These methods are identified by the numeric variable
called "Method."  Giving me one plot with 9 figures and each of the
contains 9 lines. 

My problem arises because I would like to repeat the creation of this
plot 8
times, in each instance only a subset (eg 6) of the 9 methods are used
different subset each time). 

What I can't figure out:
I would like to learn how to specify the exact line color that
to each method such that Method==1 will always be represented by the
color (in every plot that it appears in).  Where two methods that I used
were of the same family of methods (say method==1 and method==2 made the
same assumptions about the data)  I would like to, if possible,
the two methods using the same color and distinguish them by the symbol
to represent points on the line. 

My code as it currently stands:
xyplot(MeanBxg ~ PercentVarExplained | bdg.f * bdx.f, data=common,
groups=common$Method.f, type="l", subset= Method!=4, auto.key=T)

As the code is, the default colors assigned are repeated causing
methods to be represented by the same color with no way to distinguish
(I have not succeeded in plotting lines and points simultaneously).  

Side question: When I subset the data to particular methods, is there a
to remove the excluded methods from the key as well? (in my code
"Method" is
a numeric variable, and "Method.f" corresponds to the lengthy
of each method for the purpose of the key)

Thank you very much for your help. 

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