r - ggplot2 avoid boxes around legend symbols -


consider example plot below. i'd make little boxes around each of symbols in legend go away. how this?

 ggplot(mtcars, aes(wt, mpg, shape=factor(cyl))) + geom_point() + theme_bw() 

you're looking for:

 + opts(legend.key = theme_blank()) 

you can see lots of examples of sorts of stuff in ?opts. couldn't remember off top of head 1 was, tried few until got right.

note: since version 0.9.2 opts has been replaced theme:

+ theme(legend.key = element_blank()) 

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