How to plot a subset of a data frame in R?

Question

Is there a simple way to do this in R:

plot(var1,var2, for all observations in the data frame where var3 < 155)

It is possible by creat

Answer 1

Most straightforward option:

plot(var1[var3<155],var2[var3<155])

It does not look good because of code redundancy, but is ok for fastndirty hacking.