Thanks for your post. I'd like to try dstack. In line 4 of your code, you have: data("midwest", package = "ggplot2") # midwest <- read.csv("http://goo.gl/G1K41K") # bkup data source, so I presume you do not mean "# midwest ..." to be commented out. It would come before the data() call.

Also, when I uncomment your plot(gg), I get a nice scatterplot, so that is good.

But when I try to execute the next line, I get an error. Should a .yaml flie be copied from somewhere?