如何从另一个 data.table [R] 中删除一个 data.table 中指定的组组合

Question

如何从另一个数据表中删除一个数据表中指定的组组合（最好使用 R 中的 data.table）？

我显然可以循环这个，但我的真实数据是 10,000 多行和许多组，所以我想要一个更有效的方法。

library(data.table)

baseframe <- data.table(
  group_a=c("a_1","a_4","a_3","a_1","a_2","a_1","a_3","a_1"),
  group_a=c("b_5","b_2","b_1","b_5","b_3","b_5","b_3","b_6"),
  group_a=c("c_3","c_1","c_1","c_3","c_1","c_3","c_2","c_3"),
  stringsAsFactors = F
)

removeframe <- data.table(
  group_a = c("a_3","a_1","a_3"),
  group_b = c("b_3","b_5","b_3"),
  group_c = c("c_2","c_3","c_1"),
  stringsAsFactors = F
)

desiredframe <- baseframe[-c(7,1,4,6),]

Answer 1

更改列名并进行反连接

setnames(removeframe, names(baseframe))
baseframe[!removeframe, on = .(group_a, group_b, group_c)]