[R] How to plot two graphs on one single plot?

[Yun Zhang]

Thanks, it works. Thank you very much.

Yun

Matthew Keller wrote:
> Hi Yun,
>
> If you're asking how to place new graphic material on the same plot
> (e.g., several lines/points/etc in a single x-y region), this is
> covered in the Intro to R manual. E.g., you can do:
>
> plot(x1, y1, type='p', xlim=range(x1,x2), ylim=range(y1, y2),
> xlab='x', ylab='y')
> points(x2, y2, col="red")
>
> see ?lines ?points ?text ?abline Also, see the "new" option in par
>
> Best,
>
> Matt
>
> On 2/23/07, Yun Zhang <yunzhang at princeton.edu> wrote:
>> Hi,
>>
>> I am trying to plot two distribution graph on one plot. But I dont know
>> how. I set them to the same x, y limit, even same x, y labels.
>>
>> Code:
>>  x1=rnorm(25, mean=0, sd=1)
>>  y1=dnorm(x1, mean=0, sd=1)
>>
>>  x2=rnorm(25, mean=0, sd=1)
>>  y2=dnorm(x2, mean=0, sd=1)
>>  plot(x1, y1, type='p', xlim=range(x1,x2), ylim=range(y1, y2), xlab='x',
>> ylab='y')
>>  plot(x2, y2, type='p', col="red", xlab='x', ylab='y')
>>
>> They just dont show up in one plot.
>>
>> Any hint will be very helpful.
>>
>> Thanks,
>> Yun
>>
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>>
>
>