Format barchart labels with commas in numbers?

[Sharon Machlis]

If I am labeling bars in a ggplot2 barchart so label values show up, adding 

geom_text(aes(label=myycolname), vjust=1.5, colour="white", position=position_dodge(.9), size=5)

as demonstrated in the R Graphics Cookbook, is there a way to format the label numbers to show commas? My usual number-formatting option formatC won't work directly on myycol. Thanks.

[Doug Mitarotonda]

See the `comma` function in the `scales` package, so you can use `label = comma(myycolname)`. You might find it’s `dollar` and `percent` functions useful in other use cases.

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[Sharon Machlis]

Yes, that did the trick, thanks!