[R] plot focus

[pdb]

I am doing calculations in a loop and then plotting the results by adding a
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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