Good question pdb,

I would suggest you to use:
par(bg = "white")

In the beginning of the code,
But it doesn't solve the general problem of how to get the "lines" to be
properly aligned.

I am curious for the answer from betteR people.

Best,
Tal

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On Wed, Jun 30, 2010 at 1:26 PM, pdb <philb@philbrierley.com> wrote:

>
> 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?
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/plot-focus-tp2272699p2272699.html
> Sent from the R help mailing list archive at Nabble.com.
>
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