lattice and ggplot2 also offer a general way of doing this,
# first create a data.frame in the long format containing the two
data sets
x1 <- seq(-10, 10)
x2 <- seq(-8, 12)
y1 <- sin(x1/3)
y2 <- cos(x2/2)
d1 <- data.frame(x=x1, y=y1, var="1")
d2 <- data.frame(x=x2, y=y2, var="2")
library(reshape)
d <- melt(merge(d1, d2, all=T), id=c("x", "var"))
# here goes the plotting in a high-level perspective
library(ggplot2)
qplot(x, value, data=d, geom=c("line","point"), colour=var)
or,
library(lattice)
xyplot(value ~ x, data=d, type="b", groups = var)
On 12 Feb 2009, at 09:09, Jim Lemon wrote:
liujb wrote:
Dear R users,
I need to compare two scatter plots,
plot(x1, y1)
plot(x2, y2)
and would like to plot them in the same figure. How do I do it?
Hi liujb,
How about this:
plot(x1,y1,xlim=range(c(x1,x2)),ylim=range(c(y1,y2)),col="red")
points(x2,y2,col="blue")
Jim
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_____________________________
Baptiste Auguié
School of Physics
University of Exeter
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EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
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and provide commented, minimal, self-contained, reproducible code.
