[R] Christmas tree graphs

[Andrew C. Ward]

Hello R users,

I wish to draw a type of horizontal bar chart for two groups (males and 
females). The values for one group will start at the y-axis and point to the 
left, and the values for the other group will start at the y-axis and point to 
the right. If you're (un)lucky, the resulting graph can assume the shape of a 
Christmas tree.

The data are
	left.side <- c(107092, 113053, 121163, 112209, 106543, 72895, 46920, 
32606, 11106, 1134, 60, 5247)
	right.side <- c(102129, 109261, 123291, 117322, 110397, 71027, 50319, 
43805, 21074, 3621, 204, 6608)

The R function barchart allows me to stack bars and to juxtapose them, but I 
can't see how to draw the bars outwards from a centreline. If anyone had some 
hints on how to do this, I would be very grateful. Thank you!

Regards,

Andrew C. Ward

CAPE Centre
Department of Chemical Engineering
The University of Queensland
Brisbane Qld 4072 Australia
andreww at cheque.uq.edu.au
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