# [R] plot focus

Greg Snow Greg.Snow at imail.org
Wed Jun 30 23:34:41 CEST 2010

I would generally write a function to create the entire first plot, then the entire 2nd plot based on data or other arguments passed in, then in your loop or whatever call the function with the different steps. This will recreate the plots from scratch at each step rather than adding to the existing plots, but often works simpler.

If you really want to add to the plots, here is one way:

library(TeachingDemos)

plot.new()

p1 <- subplot( plot(iris[,1], col='red', ylim=range(iris[,1:2])), x=c(0,1), y=c(0.6,1) )
p2 <- subplot( plot(iris[,3], col='blue', ylim=range(iris[,3:4])), x=c(0,1), y=c(0,0.4) )

par(p1)
lines(iris[,2],col="pink",lwd=8)

par(p2)
lines(iris[,4],col="green",lwd=8)

hope this helps,

--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of pdb
> Sent: Wednesday, June 30, 2010 4:27 AM
> To: r-help at r-project.org
> Subject: [R] plot focus
>
>
> I am doing calculations in a loop and then plotting the results by
> point to each of 2 charts at the end of the loop. Its very informative
> as
> you can see the progression through time.
>
> My problem is, if I have 2 plots, I don't know how to get the focus
> back to
> the first plot.
>
> layout(matrix(c(1,2)))
>
> plot(iris[,1],col="red",) #plot1
> plot(iris[,3],col="blue") #plot2
>
> #goes on plot2
> lines(iris[,2],col="pink")
>
> #how do I put this line on plot 1
> lines(iris[,4],col="black")
>
>
> I tried the method below but when you switch the focus back to screen 1
> the
> line gets drawn not where I expect
>
> split.screen(c(2,1))
> screen(1) # prepare screen 1 for output
> plot(iris[,1],col="red",) #plot1
> screen(2) # prepare screen 2 for output
> plot(iris[,3],col="blue") #plot2
>
> screen(1)
> lines(iris[,2],col="pink",lwd=8)
>
> screen(2)
> lines(iris[,4],col="green",lwd=8)
>
> Any pointers please as to what I need to do?
>
> --
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