Question

Is a way to re-plot something but using a subsetted dataset without writing the entire code out again?

maybe something like last_plot() but allow one to specific the data.frame to use?

Answer 1

You can use the %+% operator:

##Two data sets:
R> dd = data.frame(x = runif(10), y=runif(10))
R> dd_new = data.frame(x = runif(10), y=runif(10))

R> g = ggplot(dd, aes(x,y)) + geom_point() 
R> g
R> g %+% dd_new