[R] basic graphics
Ross Ihaka
ihaka at stat.auckland.ac.nz
Mon Dec 7 23:25:36 CET 1998
Here is a simple example showing how to use colors and symbols:
# create some fake data, x, y, and group
x <- runif(100)
y <- runif(100)
g <- rep(1:4, 25)
# colors: plot with col=1 for group1, col=2 for group2 ...
plot(x, y, col=g)
# symbols: plot with pch=1 for group1, pch=2 for group2 ...
plot(x, y, pch=g)
# Both colors and symbols
plot(x, y, col=g, pch=g)
# customised colors and symbols
plot(x, y, col=c("red","green","blue","yellow")[g])
plot(x, y, pch=c(1,3,7)[g])
To see why these last two work, just print the value of
c("red","green","blue","yellow")[g]
Hope this helps.
Ross
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