我有这样的文件夹结构:
- ConditionA
- Subcondition1
- data1.Rds
- data2.Rds
- Subcondition2
- data1.Rds
- data2.Rds
- ConditionB
- Subcondition1
- data1.Rds
- data2.Rds
- Subcondition2
- data1.Rds
- data2.Rds
使用
list.files(recursive = T, full.names = T)
给出以下内容:
"./ConditionA/Subcondition1/data1.Rds"
"./ConditionA/Subcondition1/data2.Rds"
"./ConditionA/Subcondition2/data1.Rds"
"./ConditionA/Subcondition2/data2.Rds"
"./ConditionB/Subcondition1/data1.Rds"
"./ConditionB/Subcondition1/data2.Rds"
"./ConditionB/Subcondition2/data1.Rds"
"./ConditionB/Subcondition2/data2.Rds"
但是,我想要的是代表嵌套文件夹结构的列表列表。该列表应该与我将在这里手动构建的列表相同:
sublist1 <- list("data1.Rds", "data2.Rds")
sublist2 <- list("data1.Rds", "data2.Rds")
sublist3 <- list("data1.Rds", "data2.Rds")
sublist4 <- list("data1.Rds", "data2.Rds")
sublist5 <- list(sublist1, sublist2)
names(sublist5) <- c("Condition1", "Condition2")
sublist6 <- list(sublist3, sublist4)
names(sublist6) <- c("Condition1", "Condition2")
final_list <- list(sublist5, sublist6)
names(final_list) <- c("ConditionA", "ConditionB")
让我们看看:
final_list
给出输出:
$ConditionA
$ConditionA$Condition1
$ConditionA$Condition1[[1]]
[1] "data1.Rds"
$ConditionA$Condition1[[2]]
[1] "data2.Rds"
$ConditionA$Condition2
$ConditionA$Condition2[[1]]
[1] "data1.Rds"
$ConditionA$Condition2[[2]]
[1] "data2.Rds"
$ConditionB
$ConditionB$Condition1
$ConditionB$Condition1[[1]]
[1] "data1.Rds"
$ConditionB$Condition1[[2]]
[1] "data2.Rds"
$ConditionB$Condition2
$ConditionB$Condition2[[1]]
[1] "data1.Rds"
$ConditionB$Condition2[[2]]
[1] "data2.Rds"
如何实现自动化而不是手动构建列表?
一个有趣的练习是使用递归函数来完成此操作。
fun <- function(L) {
len1 <- lengths(L) == 1
c(
L[len1],
if (any(!len1)) lapply(
split(lapply(L[!len1], `[`, -1), sapply(L[!len1], `[[`, 1)),
fun)
)
}
使用类似的树层次结构:
list.files(recursive = TRUE, full.names = TRUE)
# [1] "./ConditionA/Subcondition1/data1.Rds" "./ConditionA/Subcondition1/data2.Rds" "./ConditionA/Subcondition2/data1.Rds"
# [4] "./ConditionA/Subcondition2/data2.Rds" "./ConditionB/Subcondition1/data1.Rds" "./ConditionB/Subcondition1/data2.Rds"
# [7] "./ConditionB/Subcondition2/data1.Rds" "./ConditionB/Subcondition2/data2.Rds"
我们可以这样做:
list.files(recursive = TRUE, full.names = TRUE) |>
sub("^\\./", "", x = _) |>
# optional? just stripping the leading "./"
strsplit("/") |>
fun() |>
str()
# List of 2
# $ ConditionA:List of 2
# ..$ Subcondition1:List of 2
# .. ..$ : chr "data1.Rds"
# .. ..$ : chr "data2.Rds"
# ..$ Subcondition2:List of 2
# .. ..$ : chr "data1.Rds"
# .. ..$ : chr "data2.Rds"
# $ ConditionB:List of 2
# ..$ Subcondition1:List of 2
# .. ..$ : chr "data1.Rds"
# .. ..$ : chr "data2.Rds"
# ..$ Subcondition2:List of 2
# .. ..$ : chr "data1.Rds"
# .. ..$ : chr "data2.Rds"
(相同的输出,但用
str()
进行了压缩,以便在此处演示。)