[GRASSLIST:3024] RE: [gislist] US cities and counties

[Hamish]

> As I mentioned, I am compiling corn yield data for the grain belt US
> based on county-wide data for about 14 states.  Eventually I will need
> to plot these data to analyze yield spatial distribution.  So I need
> to be able to assign these county production values to some location,
> probably the geographic center of each county.


Not exactly your question, but you might try GRASS 5.7's d.vect.chart:
http://mpa.itc.it/radim/g51/d.vect.chart_bar.png
http://mpa.itc.it/radim/g51/d.vect.chart_pie.png


Hamish