[R] How to plot several graphs in a single 2-D figure?

[Peter Dalgaard BSA]

"Feng Zhang" <f0z6305 at labs.tamu.edu> writes:

> Hi, R-listers
> 
> I tried to plot several graphs in a sigle x-y coordinate settings, like the
> following:
> |(y)                           s
> |    ******               s
> |               *****      s
> |    sssssssssssssssssss
> |_______________________________(x)
> where "*" and "s" denote two diffrent plots.
> 
> However, when I used
> plot(data1); % data1 is the data points of "*"
> par(new=T);
> plot(data2); % data2 is the data points of "s"
> 
> I found that the x and y labels are messed up, since different graphs use
> diffrent unit length on the x-axis and y-axis.
> 
> So is there someway to avoid this problem?
> Or is there some other function plottting multiple plots in
> one x-y axis setting?

There are several. I assume data1 and data2 are data frames with an x
and a y column? Then you might do

plot(rbind(data1,data2),type="n")
points(data1,pch=1) 
points(data2,pch=2)

Another way is to do what you already did, but add explicit xlim and
ylim arguments.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907