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

[Steven McKinney]

Broadly speaking, there are a few classes 
of plotting functions.

1)  "New graph" functions.
The plot() function starts a new graph.

2)  "Add to a graph" functions
The points(), lines(), text() etc. functions
add something to the current graph.

3)  "Control graph" functions
par() controls various aspects of the graph.

R graphics experts might have some better
classification and terminology.

So you want your second plotting function to be
points() rather than plot(), to add to the
existing graph.  

Try

>  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')
>  points(x2, y2, type='p', col="red", xlab='x', ylab='y')
> 

Steven McKinney

Statistician
Molecular Oncology and Breast Cancer Program
British Columbia Cancer Research Centre

email: smckinney at bccrc.ca

tel: 604-675-8000 x7561

BCCRC
Molecular Oncology
675 West 10th Ave, Floor 4
Vancouver B.C. 
V5Z 1L3
Canada




-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch on behalf of Yun Zhang
Sent: Fri 2/23/2007 7:34 AM
To: Henrique Dallazuanna
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] How to plot two graphs on one single plot?
 
Thanks. Now R plots two graphs on one plot.
Yet they are still on two graphs, vertically parallelized with each other.

But what I want to do is actually plotting two distribution on one 
single graph, using the same x and y axis. Like:
|
|
|               (dist2)
|   (dist 1)
|
--------------------------->

Is it possible to do that?

Thanks,
Yun

Henrique Dallazuanna wrote:
> par(mfrow=c(2,1))
> #your plot
> #after plot
> par(mfrow=c(1,1))
>
> On 23/02/07, *Yun Zhang* <yunzhang at princeton.edu 
> <mailto: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
>
>     ______________________________________________
>     R-help at stat.math.ethz.ch <mailto:R-help at stat.math.ethz.ch> mailing
>     list
>     https://stat.ethz.ch/mailman/listinfo/r-help
>     <https://stat.ethz.ch/mailman/listinfo/r-help>
>     PLEASE do read the posting guide
>     http://www.R-project.org/posting-guide.html
>     and provide commented, minimal, self-contained, reproducible code.
>
>
>
>
> -- 
> Henrique Dallazuanna
> Curitiba-Paraná
> Brasil

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