Re: [R] pie chart in lattice - trellis class

From: Deepayan Sarkar <deepayan.sarkar_at_gmail.com>
Date: Sun, 27 May 2007 15:21:31 -0700

On 5/27/07, Patrick Giraudoux <patrick.giraudoux_at_univ-fcomte.fr> wrote:
> Dear all,
>
> After going through the Lattice doc and R-help list and google, I got
> the feeling that there is no function in lattice or other package to
> compute a pie chart object of class "trellis". Although pie charts are
> obviously not considered optimal even in the pie() doc ;-) , pie chart
> trellis objects would be easy positioned e.g. over a map drawn with the
> grids package.
>
> Can anybody confirm this absence or indicate a package/function able to
> draw a pie chart object of class trellis?

I can confirm that lattice does not produce "trellis" objects representing pie charts (although I guess it can be made to do so with a user supplied panel function). However, I don't see how that would have helped you with the map example, as plotting a "trellis" object would also include the axes, labels, etc. What you really want is the ability to draw a circle with differently colored angular segments, which can be reasonably approximated by polygons. polygon() and grid.polygon() do these for traditional and grid graphics respectively.

-Deepayan



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