Metaprogramming with ggplot2

Question

I\'ve been trying to cut down on the amount of copying and pasting required to make a large number of charts with slightly differing functions / slices of the data.

Answer 1

facet_grid() takes a formula object, and you can create a formula object from a string with as.formula(). So you should be able to do something like:

 facet_grid(as.formula(paste(rowfacet, "~", colfacet)))

Answer 2

You should use

... + facet_grid(as.formula(sprintf("%s ~ %s", rowfacet, colfacet))

in your code.