我有一个数据框df.
df <- data.frame(shop = c("A", "A", "A", "B", "B", "B", "C", "C", "C"),
product = c(1,2,3,4,5,1,5,2,4))
对于每对商店，即AB, AC and BC，我想统计一下常见产品的数量。
预期输出如下
pair common_product
AB 1 # Because 1 is common
AC 1 # Because 2 is common
BC 2 # Because 5 and 4 is common
基本 R 选项是：
pair <- combn(unique(df$shop), 2, paste0, collapse = "")
commmon_product <- combn(unique(df$shop), 2, function(x)
with(df, length(intersect(product[shop == x[1]], product[shop == x[2]]))))
data.frame(pair, commmon_product)
# pair commmon_product
#1 AB 1
#2 AC 1
#3 BC 2
对于每一个组合shop我们找出有多少个值product intersect using combn.
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