规则:从规则中提取lhs项 [英] R arules : Extract lhs items from rules

问题描述

我想从规则生成的规则中提取lhs个项目.

I want to extract lhs items from a rule generated from arules.

例如，

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

我希望能够提取a,b,c并将其放入字符向量中，因此我可以基于这些项目进行迭代并进行进一步处理.

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

目前，我可以考虑解析规则集，将其转换为数据框，然后使用字符操作/正则表达式将这些项目分开.我希望有更好的方法来提取这些项目.

At the moment, I can think of parsing the set of rules, converting it to a data frame and then separate these items using character manipulation/regex. I hope there's better way of extracting these items.

推荐答案

只需将LHS和/或RHS强制列出:

Just coerce the LHS and/or the RHS into a list:

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

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

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