[R] difference between two density plots
Roger.Bivand at nhh.no
Thu Apr 6 21:11:33 CEST 2006
On Thu, 6 Apr 2006, Duncan Murdoch wrote:
> On 4/6/2006 1:34 PM, Philipp H. Mohr wrote:
> > Hello,
> > I have two densities which I plot with:
> > sm.density(gps)
> > sm.density(gps2)
> > Both data sets are 2D and have the same scale.
> > Is there a way of plotting the difference between the two density plots ?
> ?sm.density describes the value returned by those function calls, which
> includes "the values of the density estimate at the evaluation points".
> The evaluation points may be different between the two datasets, but
> you could use approxfun to generate functions doing linear interpolation
> for each of them, and then evaluate the density difference whereever you
The eval.points can be set using sm.options(), fixing them to be the same.
> Duncan Murdoch
> R-help at stat.math.ethz.ch mailing list
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Economic Geography Section, Department of Economics, Norwegian School of
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