[R] ylab at the right hand of a plot with two y axes

From: Young Cho <young.stat_at_gmail.com>
Date: Tue, 26 Jun 2007 09:29:05 -0700

When I try to plot two lines ( or scatterplots) with different scales, this is what I have been doing:

Suppose: I have y1 and y2 in a very different scale

y1 = 1:100
y2 = c(100:1)*10

To plot them on top of each other and denote by different colors: I have to figure out the correct scale '10' and corresponding tick.vector and lables. Then do:

plot(1:100, y1) # I can have 'ylab' here for the left-hand side y axis. points(1:100, y2/10,col=2)
ytick.vector = seq(from=0,to=100,by=20)
ytick.label = as.character(seq(from=0,to=1000,by=200)) axis(4,at = ytick.vector,label = ytick.label,col=2,col.axis=2)

Two questions.

  1. Are there easier ways to plot the y1, y2 w/o figuring out the correct scaler, tick vectors, and labels in order to put them in one figure?
  2. How to add additional 'ylab' to the right hand side y-axis of the plot? Thanks a lot!


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