Is there a way to create non-LaTeX graphs outside of GUI?

[bjoernholzhauer]

Perhaps I missed this, but is there an easy way to turn the testing procedures into a graph without going into the GUI that can be used in other documents? The LaTeX ones look nice enough (while the GUI ones are less well suited for formal documents), but going via program output -> LaTeX -> pdf -> what I want seems a bit convoluted. E.g. the ability to just run a bit of code in a R session and get the graph in the graph window, or being able to automatically create a png/jpeg (or similar) from a batch script would be really nice.