I'm using `plotrix` in `R` to plot a state level map of the US. It has an excellent function `floating.pie` to put pie charts on each state.

I'm wondering if there are similar functions within the `plotrix` package to display bar charts in each state? (I took a look at the documentation and the functions that deal with bar charts don't seem to have this possibility, but I just wanted to be sure.) I prefer to work within the plotrix package if possible, but feel free to name other packages.

As an example, I would be interested in producing a map similar to this (but for the US): 

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/A3Fae.png

For my US map, there would be 50 bar charts, one for each state. 

I got this map from http://stackoverflow.com/questions/20465070/barplots-on-a-map, but it seems that ggsubplot doesn't work on my version of R (similar to what others have been saying on the post).