R：将列表组件的值连接到另一个定义哪些组件在一起的列表

Question

我有两个列表。 lst1 包含表示变量名称的字符向量：

lst1 <- list(c("var1", "var2"),
             "item1",
             c("var12", "var15", "var17"),
             c("item3", "item5", "item7"),
             "var22",
             c("var27", "var29", "var33", "var34"))

如您所见，lst1 中的某些组件包含一个或多个变量名称。 lst2包含 lst1 中每个变量名称的值，但每个都在单独的组件中：

lst2 <- list(var1 = as.character(c(1, 2, 3, 5, 6)),
             var2 = as.character(c(1, 3, 4, 5, 6, 7)),
             item1 = letters[1:5],
             var12 = as.character(1:3),
             var15 = as.character(1:5),
             var17 = as.character(1:6),
             item3 = letters[3:8],
             item5 = letters[4:9],
             item7 = letters[5:10],
             var22 = as.character(2:7),
             var27 = as.character(4:10),
             var29 = as.character(3:8),
             var33 = as.character(1:4),
             var34 = as.character(4:9))

这两个列表要大得多，是我处理过的以前代码的产物。我想要实现的是获得一个列表 lst1，其中每个组件都包含来自 lst2 的连接元素，而不是变量名称，用于属于 lst1 中该组件的所有名称，像

lst3 <- list(c("1", "2", "3", "5", "6", "1", "3", "4", "5", "6", "7"),
             c("a", "b", "c", "d", "e"),
             c("1", "2", "3", "1", "2", "3", "4", "5", "1", "2", "3", "4", "5", "6"),
             c("c", "d", "e", "f", "g", "h", "d", "e", "f", "g", "h", "i", "e", "f", "g", "h", "i", "j"),
             c("2", "3", "4", "5", "6", "7"),
             c("4", "5", "6", "7", "8", "9", "10", "3", "4", "5", "6", "7", "8", "1", "2", "3", "4", "4", "5", "6", "7", "8", "9"))

并且可能只获取每个组件中排序后的唯一值。这怎么可能？

编辑： 我在给出 lst3 示例的部分更新了我的 post，因为我发现了 lst3 中的错误.

Answer 1

尝试

lapply(lst1, function(x) sort(unique(unlist(lst2[x], use.names=FALSE))))

如果我们不需要 sort 并获得 unique 值

lapply(lst1, function(x) unlist(lst2[x], use.names=FALSE))
#[[1]]
#[1] "1" "2" "3" "5" "6" "1" "3" "4" "5" "6" "7"

#[[2]]
#[1] "a" "b" "c" "d" "e"

#[[3]]
#[1] "1" "2" "3" "1" "2" "3" "4" "5" "1" "2" "3" "4" "5" "6"

#[[4]]
#[1] "c" "d" "e" "f" "g" "h" "d" "e" "f" "g" "h" "i" "e" "f" "g" "h" "i" "j"

#[[5]]
#[1] "2" "3" "4" "5" "6" "7"

#[[6]]
#[1] "4"  "5"  "6"  "7"  "8"  "9"  "10" "3"  "4"  "5"  "6"  "7"  "8"  "1"  "2" 
#[16] "3"  "4"  "4"  "5"  "6"  "7"  "8"  "9"

R：将列表组件的值连接到另一个定义哪些组件在一起的列表

R: Concatenate values of list components by another list defining which ones go together

r

list

indexing

concatenation