subset completion

[stevenolen]

a bit low on the priority list..

The subset feature of the plotapp is the most difficult since it just leaves the user with an empty text field and hopes they can make a valid statement to be evaluated by R.

It would be wildly cool if we could "autocomplete" the prompts we know they can use as variables to turn this text field into a more interactive procedure. Something like this project demonstrates a very cool way of handling this:
http://documentcloud.github.io/visualsearch/