# Re: [R] How to fit all points into plot?

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Fri 30 Dec 2005 - 09:57:02 EST

On 12/29/2005 5:33 PM, Sean Davis wrote:
>
>
> On 12/29/05 5:19 PM, "Martin Lam" <tmlammail@yahoo.com> wrote:
>
>

```>>Hi,
>>
>>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)
>>
>># 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)
```

>
>
> 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))),

```                   xlim=range(c(xold,xnew)),

>       ylim=c(min(c(yold,ynew)),max(c(yold,ynew))))

ylim=range(c(yold,ynew))
```

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