[R] How to fit all points into plot?

Duncan Murdoch murdoch at stats.uwo.ca
Thu Dec 29 23:57:02 CET 2005

On 12/29/2005 5:33 PM, Sean Davis wrote:
> On 12/29/05 5:19 PM, "Martin Lam" <tmlammail at yahoo.com> wrote:
>>I have a problem when I want to add new points (or a
>>new line) to the graph. Some points (or parts of the
>>line) are not shown on the graph because they lie
>>beyond the scale of the axis. Is there a way to
>>overcome this so all points (or the entire line) are
>>shown on the graph? Here's an example of my problem:
>>colors = c("red", "blue")
>>plot(x=rnorm(100,0,1), y=runif(100), type="p", pch=21,
>>col = colors[1])
>># if I add these points not all of them are shown on
>>the graph
>>lines(x=rnorm(100,3,1), y=runif(100), type="p",
>>pch=24, col = colors[2])
> You will need to use something like max and min for ALL of your x and y
> values and then set your own ylim and xlim for the plot.

This is the right idea, but a quicker way is to use the range() function:

>  xold <- rnorm(100,0,1)
>  yold <- runif(100)
>  xnew <- rnorm(100,3,1)
>  ynew <- runif(100)
>  plot(xold,yold,xlim=c(min(c(xold,xnew)),max(c(xold,xnew))),

>       ylim=c(min(c(yold,ynew)),max(c(yold,ynew))))
>  lines(xold,yold,type='p')
> This isn't tested, but I hope you get the idea.
> Sean
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