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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