[R] Newbie graphing questions
Hedderik van Rijn
hvr at van-rijn.org
Thu Aug 28 03:54:37 CEST 2003
> 1. How do I create a new plot without erasing the prior one i.e.,
> have a new window pop up with the new graph? I'm on MacOSX using the
> Carbon port.
I don't know about the Carbon version, but ?Devices should give you a
list of "Devices" you can use to output graphs to. (Using the fink
version on OS X, X11() would do what you describe.)
> 2. How do I pause between plot renderings i.e., in such a way that it
> will draw the subsequent graph after pressing the space bar (or any
> other key).
par(ask=T)
See ?par for more useful plotting options.
> 3. Illustrating critical regions. Say I wanted to illustrate the
> critical region of a standard normal. I would need to draw a vertical
> line from the critical point to the curve and then shade the critical
> region. How do I do this in R?
Based on some code found on the R mailing list some time ago, I was
able to come up with the following: (it shades an area of a lognormal
density plot after a certain deadline)
deadline <- 800
mthres <- 6.5
sthres <- 0.15
ymax <- 0.005
xmax <- 1200
plot(0,0,xlim=c(0,xmax),ylim=c(0,ymax),type="n")
thres.xvals <- dlnorm(1:xmax,meanlog=mthres,sdlog=sthres)
lines(thres.xvals,col="blue")
abline(v=deadline,col="darkgrey")
polygon(c((deadline+1):xmax,rev((deadline+1):xmax)),c(rep(0,(xmax-
deadline)),rev(thres.xvals[(deadline+1):xmax])),density=20,col="blue")
- Hedderik.
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