Hi,

Suppose I already have two plots on the same screen, and I want to draw
lines in each of them. Is that possible in R? It seems that once you have
two plots on the screen, you can only draw lines in the the last plot, never
the 1st. Here is what I mean:

#some data
y1=rnorm(1:3)
y2=rnorm(1:3)

#draw two plots on the same screen
par(mfrow=c(2,1),oma = c(6, 0, 5, 0))
par(mar=c(0, 5.1, 0, 5.1))
plot(y1,xaxt="n",type="n") #1st plot
par(mar=c(0, 5.1, 0, 5.1))
plot(y2,xaxt="n",type="n") #2nd plot

#try to draw lines onto each plot on the screen
lines(y2) #draws a line in the 2nd plot
lines(y1,col=2) #also draws a line in the 2nd plot, but that's not what I
want. I want to draw the line in the 1st plot instead.

Does anyone know if after more than one plot were drawn, can I still call
the 1st plot and draw a line in it?

Thanks,

-- 
Tom

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