> On Wed, 2005-02-23 at 17:42 -0500, rif wrote:
> > Is it possible to change the limits on plots that are already on the
> > screen? In particular, is there any R equivalent to the sequence of
> > matlab commands
> >
> > plot(1:10,1:10)
> > hold on
> > plot(2:12,5:15)
> >
> > rif
>
> I have not used Matlab, but I suspect that you want to use:
>
> par(new = TRUE)
>
> For example:
>
> > plot(1:10,1:10)
>
> # Check plot region limits
> > par("usr")
> [1] 0.64 10.36 0.64 10.36
>
> # Set par("new") to not overwrite existing plot
> > par(new = TRUE)
>
> > plot(2:12,5:15)
>
> Marc Schwartz
Marc,
This does not do what the matlab code I posted does (the matlab code
also works in the free program octave, if you want to try). The
matlab code moves already plotted data within the window (replots it).
When I first type plot(1:10,1:10), I see a graph with axis limits [1
10 1 10]. When I type hold on (to keep my original data), and execute
plot(2:12,5:15), the plot I see is equivalent to the plot I'd have
gotten if I'd originally specified axis limits [1 12 5 15]. By
contrast, in the R code you sent, it's as if I'm superimposing two
unrelated plots.
Essentially, the underlying "task" is that I want to compare multiple
functions, but I do not know good limits for the complete set of
functions when I start. Being able to adjust the graph to show all
the data I've plotted so far would be extremely useful for exploratory
analysis. This is the mode I and colleagues generally use matlab and
octave in.
Does this question get asked all the time? It seems to be something
that would come up a lot for people who switch from Matlab/Octave to
R, but I searched the archives and didn't really see anything.
Cheers,
rif
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