[R] two plots in one frame
David A Richmond
richmond at saintmarys.edu
Fri Nov 16 03:24:27 CET 2001
On Thu, 15 Nov 2001, Justin Fay wrote:
> I would like to plot two different scatterplots in the same frame (say with
> different colors) but everytime plot is called a new frame is created. Is
> there a way around this?
if, say, you want to plot 2 sets of y's against the same x, the
following:
plot(x,y1,ylim=range(c(y1,y2)))
points(x,y2,pch=17)
makes sure that all the data from y2 are displayed in the plot. If you
don't specify the 'ylim=...' option, you won't get all the data in if some
values of y2 are outside the range of y1. pch=17 tells it to use a
different symbol (the default symbol is a circle, and pch=17 is a
triangle).
daver
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