[R] multiple lines on multiple plots

jim holtman jholtman at gmail.com
Tue Apr 12 18:25:48 CEST 2011

Instead of trying to go back to a previous plot, gather up all the
data for the plots and generate each one with the appropriate data.
This is much easier than trying to keep track of what the dimensions
are.  Also if the data you want to add is outside the plot, then you
have issues with clipping; knowing what the dimensions of all the data
you want to plot is a reasonable way to go.

On Tue, Apr 12, 2011 at 9:30 AM, James Annan <jdannan at jamstec.go.jp> wrote:
> I'm sure this must be trivial, but I'm a novice with R and can't work out
> how to handle the axes when I am constructing multiple plots on a page and
> try to return to a previous one to put multiple data sets it.
> A simple example:
> ---
> x<- 1:10
> y<- (1:100)*3
> par(mfcol=c(2,1))
> plot(x)
> plot(y)
> par(mfg=c(1,1))
> lines(x)
> ---
> The first 5 lines make two plots with a row of dots along the diagonal of
> each. I intended the last two statements to add a line to the first plot,
> that runs along the same data points already plotted there. However,
> although the commands add a line to the top plot, it is clearly using the
> axis dimensions of the lower plot. Can someone tell me how to get it to use
> the axes that are already there?
> Variants like lines(x,xlim=c(1,10)) have no effect.
> Thanks in advance for any help.
> James
> --
> James D Annan jdannan at jamstec.go.jp Tel: +81-45-778-5618 (Fax 5707)
> Senior Scientist, Research Institute for Global Change, JAMSTEC
> (The Institute formerly known as Frontier)
> Yokohama Institute for Earth Sciences, 3173-25 Showamachi,
> Kanazawa-ku, Yokohama City, Kanagawa, 236-0001 Japan
> http://www.jamstec.go.jp/frcgc/research/d5/jdannan/
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Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?

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