rlist包(http://cran.r-project.org/web/packages/rlist/index.html)用于处理各种列表操作。

示例(http://cran.r-project.org/web/packages/rlist/vignettes/Filtering.html):

library(rlist)
devs <- 
  list(
    p1=list(name="Ken",age=24,
      interest=c("reading","music","movies"),
      lang=list(r=2,csharp=4,python=3)),
    p2=list(name="James",age=25,
      interest=c("sports","music"),
      lang=list(r=3,java=2,cpp=5)),
    p3=list(name="Penny",age=24,
      interest=c("movies","reading"),
      lang=list(r=1,cpp=4,python=2)))

list.remove(devs, c("p1","p2"))

结果:

# $p3
# $p3$name
# [1] "Penny"
# 
# $p3$age
# [1] 24
# 
# $p3$interest
# [1] "movies"  "reading"
# 
# $p3$lang
# $p3$lang$r
# [1] 1
# 
# $p3$lang$cpp
# [1] 4
# 
# $p3$lang$python
# [1] 2

你可以用which。

x<-c(1:5)
x
#[1] 1 2 3 4 5
x<-x[-which(x==4)]
x
#[1] 1 2 3 5

如果你不想就地修改列表(例如，将一个元素传递给一个函数)，你可以使用索引:负索引表示“不包括这个元素”。

x <- list("a", "b", "c", "d", "e"); # example list

x[-2];       # without 2nd element

x[-c(2, 3)]; # without 2nd and 3rd

同样，逻辑索引向量也很有用:

x[x != "b"]; # without elements that are "b"

这也适用于数据框架:

df <- data.frame(number = 1:5, name = letters[1:5])

df[df$name != "b", ];     # rows without "b"

df[df$number %% 2 == 1, ] # rows with odd numbers only

rlist包(http://cran.r-project.org/web/packages/rlist/index.html)用于处理各种列表操作。

示例(http://cran.r-project.org/web/packages/rlist/vignettes/Filtering.html):

library(rlist)
devs <- 
  list(
    p1=list(name="Ken",age=24,
      interest=c("reading","music","movies"),
      lang=list(r=2,csharp=4,python=3)),
    p2=list(name="James",age=25,
      interest=c("sports","music"),
      lang=list(r=3,java=2,cpp=5)),
    p3=list(name="Penny",age=24,
      interest=c("movies","reading"),
      lang=list(r=1,cpp=4,python=2)))

list.remove(devs, c("p1","p2"))

结果:

# $p3
# $p3$name
# [1] "Penny"
# 
# $p3$age
# [1] 24
# 
# $p3$interest
# [1] "movies"  "reading"
# 
# $p3$lang
# $p3$lang$r
# [1] 1
# 
# $p3$lang$cpp
# [1] 4
# 
# $p3$lang$python
# [1] 2

还可以使用magrittr包的提取函数从列表中进行负索引以删除列表项。

a <- seq(1,5)
b <- seq(2,6)
c <- seq(3,7)
l <- list(a,b,c)

library(magrittr)

extract(l,-1) #simple one-function method
[[1]]
[1] 2 3 4 5 6

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

我根本不懂R，但有点创造性的谷歌搜索把我带到了这里:http://tolstoy.newcastle.edu.au/R/help/05/04/1919.html

关键的一句话是:

我没有找到关于R如何从列表中删除元素的明确文档，但试验和错误告诉我

我的列表[5]<- NULL

将删除第5个元素，然后“关闭”由删除该元素引起的孔。这影响了下标值，所以我在删除元素时要小心。我必须从名单的后面到前面。

帖子后面的回复说:

删除列表中的元素，请参见R FAQ 7.1

R FAQ的相关部分说:

．.． 不要将x[i]或x[[i]]设置为NULL，因为这将从列表中删除相应的组件。

它似乎(以一种有点倒退的方式)告诉您如何删除一个元素。