rpy2
Controlling the order of points in ggplot2?
2016 Update: The order aesthetic has been deprecated, so at this point the easiest approach is to sort the data.frame so that the green point is at the bottom, and is plotted last. If you don’t want to alter the original data.frame, you can sort it during the ggplot call – here’s an example that … Read more
How to create an empty R vector to add new items
vec <- vector() See also vector help ?vector