A quick ggplot2 hack (multiple dataframes)

September 9, 2010

(This article was first published on Timothée Poisot » R, and kindly contributed to R-bloggers)

I’m starting to get familiar with ggplot2, and I really like it. I just found a very quick way to use several dataframes within the same plot, provided that the dataframes share columns names.

One obvious application is the production of graphs with the mean (obtained by aggregate) superposed to the original raw data.

You can do this in ggplot2 simply with something along the lines of

dat <- read.table(‘sampling.txt’)
dat.me <- aggregate(dat,list(NEST=dat$NEST,NRR=dat$NRR,MES=dat$MES),mean)
base <- ggplot(dat,aes(x=NRR,y=PROP,colour=MES))
base+geom_point() + geom_line(data=dat.me)

By changing the data argument, you will recycle the aes settings. This is really handy.

The result is


Now, of course, is someone knows a simpler way to do it, I’d like to know!

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