"R - 在列表条目中查找重复项"

Question

我试图弄清楚如何从 R 中的列表对象中获取重复项。所以我的示例列表：

examplelist <- list(a = c("blue", "red", "yellow"),
                    b = c("red", "black", "green"),
                    c = c("black", "green", "brown"))

Answer 1

您可以unlist ：

unlisted <- unlist(examplelist)
unlisted[duplicated(unlisted)]
#     b1      c1      c2 
#  "red" "black" "green" 

unlisted[!duplicated(unlisted)]
#      a1       a2       a3       b2       b3       c3 
#  "blue"    "red" "yellow"  "black"  "green"  "brown" 

如果您只想要向量（没有名称），请使用unname ：

unlisted <- unname(unlist(examplelist))