[R] can I add to a plot and auto-re-scale axes?

[Duncan Murdoch]

On Sun, 30 Sep 2001 22:06:47 -0400 (EDT), you wrote:

>(I'm new to R)
> 
>Is there a way to add data to an existing plot, and have the plot axes
>rescaled automatically (i.e. if the new data lie outside the current
>axes) ?

No, there's not.  The scale is established by the first call.
> 
>If not, how can I specify multiple datasets at once, so the axes are
>scaled to accomodate all sets?

You need to use the optional arguments xlim and ylim in the first
call.

Your example would look like this:

plot(expts$x[[1]], expts$y[[1]], xlim = range(c(expts$x[[1]],
expts$x[[4]], expts$x[[7]])), 
ylim = range(c(expts$y[[1]], expts$y[[4]], expts$y[[7]])))

(You might make do with something much simpler, like xlim = c(0,10),
if you know the range of the data in advance, or want consistency
across a wider range.)

You also asked whether your data was organized well.  I'd suggest not
using a list, just use single x and y vectors, with another vector
giving the experiment number.  Then you could have something like

 plot(x[expt == 1], y[expt == 1], xlim = range(x[expt %in% c(1,4,
7)]), ylim = range(y[expt %in% c(1,4, 7)])

 etc.

Duncan Murdoch
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._