R中lhs的子集设置规则

Question

我想通过以下方式在R中运行apiriori算法生成的规则子集。

规则子集必须具有LHS，LHS必须只包含另一个列表中的任何项(例如项)。不会对RHS应用任何约束。

我尝试了以下代码，但无法获得预期的结果：

> library(arules)
> library(datasets)
> data(Groceries)
> rules <- apriori(Groceries, parameter = list(supp = 0.001, conf = 0.8))
inspect(head(rules))
    lhs                                 rhs            support     confidence lift     
[1] {liquor,red/blush wine}          => {bottled beer} 0.001931876 0.9047619  11.235269
[2] {curd,cereals}                   => {whole milk}   0.001016777 0.9090909   3.557863
[3] {yogurt,cereals}                 => {whole milk}   0.001728521 0.8095238   3.168192
[4] {butter,jam}                     => {whole milk}   0.001016777 0.8333333   3.261374
[5] {soups,bottled beer}             => {whole milk}   0.001118454 0.9166667   3.587512
[6] {napkins,house keeping products} => {whole milk}   0.001321810 0.8125000   3.179840

items = c("curd","cereals")
rules.subset2 <- subset(rules, subset = all(lhs %in% items))

此子设置操作产生以下结果(这是错误的，因为我只想在规则子集中使用"curd and cereals“作为LHS )

inspect(head(rules.subset2))
          lhs                                                                           rhs                support     confidence lift     
    [1]   {liquor,red/blush wine}                                                    => {bottled beer}     0.001931876 0.9047619  11.235269
    [2]   {curd,cereals}                                                             => {whole milk}       0.001016777 0.9090909   3.557863
    [3]   {yogurt,cereals}                                                           => {whole milk}       0.001728521 0.8095238   3.168192
    [4]   {butter,jam}                                                               => {whole milk}       0.001016777 0.8333333   3.261374
    [5]   {soups,bottled beer}                                                       => {whole milk}       0.001118454 0.9166667   3.587512
    [6]   {napkins,house keeping products}                                           => {whole milk}       0.001321810 0.8125000   3.179840

我试着在这个网站上找到答案，但没有成功。我还尝试了其他各种方法，但都没有成功。

如果你能帮助我，我将不胜感激。

Answer 1

当我尝试这样做时，它起作用了：

rules.subset2 <- subset(rules, lhs %in% c("cereals", "curd"))

多步骤将“谷类”和“凝乳”同时包括在lhs中：

sub_2<- subset(rules, lhs %in% "cereals")

sub_3<- subset(sub_2, lhs %in% "curd")

Answer 2

我认为操作符是%ain%，所以应该是这样的：

lhs %oin% c('cereals', 'curd')

Answer 3

该文档提供了一个示例

## select only rules with items "age=Young" and "workclass=Private" in
## the left-hand-side
rules.sub <- subset(rules, subset = lhs %ain% 
    c("age=Young", "workclass=Private"))