[R] Reccomendation for graphics package

Zeljko Vrba zvrba at ifi.uio.no
Fri May 1 22:41:48 CEST 2009

On Fri, May 01, 2009 at 03:23:18PM -0500, hadley wickham wrote:
> If you have a categorical x axis, you need to specify the group
> aesthetic which defines what group of points should form a line.  It's
> hard to tell what that should be from your example, maybe sp?

Yes, adding group=sp works.  Thank you.

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