Extract lhs items from rules in R

Question

How to extract lhs items from rules generated from arules?

For example, consider,

{a,b,c} => {d}

I want to extract a,b,c and put it in a character vector. I want to do this so that I can iterate and do further processing based on these items.

I have thought of a way where I can parse a set of rules, convert it to a data frame and then separate items using character manipulations.

Is there any better way to do this?

Answer 1

Try the following code:

data("Adult")
rules <- apriori(Adult, 
   parameter = list(supp = 0.5, conf = 0.9, target = "rules"))

as(lhs(rules), "list")
as(rhs(rules), "list")