force ggplot to evaluate counter variable

Question

I ran into an interesting problem regarding how/when variables are evaluated in ggplot constructs.

The simplest example I can think of to reproduce this is the foll

Answer 1

The aes() specifically prevents evulation. If you want evaulation, you can use the standard-evaluation version aes_()

panel=ggplot() + xlim(-1,11) + ylim(-1,11)
for (i in c(1:10)) {
    panel=panel+geom_point(aes_(x=df$x[i],y=df$y[i]))
}
print(panel)