crf questions

• A more elegant way to compute within-group proportions in dplyr? [duplicate]
• How can I make a list of all the unique pairs of data points in R?
• Is it possible to have `dput` return source code that would run outside of the enclosing environment?
• How to update the value of a row of a WPF DataGrid from IronPython?
• How do I tell an R6 class what to do with square brackets?
• Using grequests to make several thousand get requests to sourceforge, get "Max retries exceeded with url"

crf answers