[R] ggplot2 qplot pch not working anymore

[Stephen Sefick]

Is there a way to use a continuous variable to pch in qplot?  I believe 
this worked in previous version.  I need to specify certain values of a 
shape for particular points so that multiple graphs all show the same 
shapes for the same streams.  I have gone to the original data and added 
a pch column that I would like to use to specify the shapes to pch in 
qplot.  Any help would be greatly appreciated.

#example code
a <- 1:10
b <- 1:10
pch <- 1:10

q <- data.frame(a,b,pch)

qplot(a,b, pch=pch)

Many thanks,

-- 
Stephen Sefick
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Auburn University
Biological Sciences
331 Funchess Hall
Auburn, Alabama
36849
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sas0025 at auburn.edu
http://www.auburn.edu/~sas0025
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