[R] Two overlaid density plots - Does order matter?

stephen sefick ssefick at gmail.com
Thu Sep 25 18:22:31 CEST 2008

this is not reproducible, but this may be the answer--  R graphic
devices are like a pen and paper when you plot something it is there
on the piece of paper then when you plot something else on top of that
then if there are any points that intersect with the first plot then
they will be plotted on top of the points from the old graph

plot(1,1, col="blue")

On Thu, Sep 25, 2008 at 11:54 AM, Stephen Collins
<Stephen_Collins at aon.com> wrote:
> In the following code, the only difference between the two plots is the
> order the variables are plotted.  In this case, the plot of "cdata.den" in
> plot #1 is different from its plot in #2. Specifically, "cdata.den" spans
> the x-axis from -5 to 30 in plot #1 and from 0 to 20 in plot #2. Does
> anyone understand why these two plots do not yield the same result?
> #Make density objects
> pre.den<- density(
>        preclaims[preclaims[,7]>cc1 & preclaims[,7]<cc2,7],
>        from = cc1,
>        to = cc2)
> cdata.den<-density(cdata,from=cc1,to=cc2)
> #Plot No. 1
> x11()
> plot(cdata.den,col=1)
> lines(pre.den,col=2)
> #Plot No. 2
> plot(pre.den,col=2)
> lines(cdata.den,col = 1)
>  Regards,
> Stephen Collins, MPP | Analyst
> Health & Benefits | Aon Consulting
> 200 East Randolph, Suite 900, Chicago, IL
> Tel: 312-381-2578 | Fax: 312-381-0136
> Email: stephen_collins at aon.com
>        [[alternative HTML version deleted]]
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Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

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