> Three questions:
> 1a) Why does the following code not produce transparent bars?
Because you're setting the fill colour (not mapping it to a variable
in your dataset), the fill needs to be outside of aes()
g +
geom_histogram(aes(x=log(BNCw)), fill = alpha("red", .5)) +
geom_histogram(aes(x=log(BNCc)), fill = alpha("blue", .5))
> 1b) How can I manually specify the elements of the legend for this
> version of the plot?
Use the "manual" scale:
g +
geom_histogram(aes(x=log(BNCw), fill = "w")) +
geom_histogram(aes(x=log(BNCc), fill = "c")) +
scale_fill_manual("BNC type", values = alpha(c("red","blue"), 0.5))
Hadley
--
http://had.co.nz/
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
