agh

entropy.df <- subset(
  tickets.df[
    1:nrow(
      tickets.df
    )
    %in% which(
      outer(
        subset(
          tickets.df, 
          period == "hadean"
        )$user,
        subset(
          tickets.df, 
          period == "prehadean"
        )$user,
        "=="
       ), 
       arr.ind=TRUE
    ),
  ], period == "hadean"
)

#Ookay, this isn't working. It should be pulling out all tickets with period "hadean" with a userID matching a userID from the tickets with period "prehadean". It returns a null. I can /see/ userIDs present in both. The fuck?

Why doesn't

hadean.ids <- tickets.df[tickets.df[, "period"] == "hadean", "user"]

entropy.df <- tickets.df[tickets.df[, "user"] %in% hadean.ids & tickets.df[, "period"] == "prehadean", "user"]

Work?

That appears to pull out all matching userIDs rather than all rows with matching userIDs.

That's just because the second line has a column selected.

entropy.df <- tickets.df[tickets.df[, "user"] %in% hadean.ids & tickets.df[, "period"] == "prehadean", ]

Will subset the df.

Clever. Is 'I have a moral aversion to creating objectnames' a useful explanation to the implicit 'why is the gist written like lisp, you jerkhole' question?