删除列表中数据框中的一列 [英] Delete a column in a data frame within a list
本文介绍了删除列表中数据框中的一列的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我根据A列中的因子水平从数据框中列出了一个列表.在列表中,我想删除该列.我的脑袋说得很烂,但没有其他:P
I made a list out of my dataframe, based on the factor levels in column A. In the list I would like to remove that column. My head is saying lapply, but not anything else :P
$A
ID Test
A 1
A 1
$B
ID Test
B 1
B 3
B 5
进入
$A
Test
1
1
$B
Test
1
3
5
推荐答案
假设您的列表名为myList
,则类似这样的方法应该起作用:
Assuming your list is called myList
, something like this should work:
lapply(myList, function(x) { x["ID"] <- NULL; x })
更新
对于更通用的解决方案,您还可以使用以下内容:
Update
For a more general solution, you can also use something like this:
# Sample data
myList <- list(A = data.frame(ID = c("A", "A"),
Test = c(1, 1),
Value = 1:2),
B = data.frame(ID = c("B", "B", "B"),
Test = c(1, 3, 5),
Value = 1:3))
# Keep just the "ID" and "Value" columns
lapply(myList, function(x) x[(names(x) %in% c("ID", "Value"))])
# Drop the "ID" and "Value" columns
lapply(myList, function(x) x[!(names(x) %in% c("ID", "Value"))])
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