[R] two plots in one frame

[kjetil halvorsen]

First scatterplot:

plot(x,y,col="blue")

second:

points(z,t, col="red")

Note that the coordinate system fixed by the first call to plot
cannot be changed, so if tthe (z,t) points fall outside, it is necessary
to include xlim=c(,) and ylim=c(,) as arguments to the first call.

Kjetil Halvorsen.

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?
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