[英]Pasting the column name to each value of a dataframe in R
Hoping this isn't a repeat- I've had a search around but can't find quite what I'm looking for.希望这不是重复 - 我已经搜索过,但找不到我正在寻找的东西。
I have a dataframe (df) in R我在 R 中有一个数据框(df)
1 2 3 4 5
1 1 0.5 0.5 0 1
2 0.5 0.5 0.5 0 1
3 1 1 0 0 1
4 1 1 0 0 1
5 1 1 0 0 1
(with the 1-5 indicating row and column names) (1-5表示行列名)
I would like to paste the column name to each cell, separated by a ":" so that it looks like this:我想将列名粘贴到每个单元格中,用“:”分隔,使其看起来像这样:
1 2 3 4 5
1 1:1 2:0.5 3:0.5 4:0 5:1
2 1:0.5 2:0.5 3:0.5 4:0 5:1
3 1:1 2:1 3:0 4:0 5:1
4 1:1 2:1 3:0 4:0 5:1
5 1:1 2:1 3:0 4:0 5:1
However, my actual data is quite a bit larger.但是,我的实际数据要大一些。
I currently have我目前有
apply(df, 2, function(x) paste(colnames(df)[x], x, sep=":"))
Of course this doesn't work as colnames(df)[x] doesn't make any sense.当然,这不起作用,因为 colnames(df)[x] 没有任何意义。 Is there anything I can put in that first 'paste' term to get this sorted?
有什么我可以在第一个“粘贴”术语中放入的东西来排序吗? Or another function to do a better job?
或者其他功能可以做得更好?
Thanks.谢谢。
To explain my comment, Map
is a multivariate version of lapply
, so为了解释我的评论,
Map
是lapply
的多元版本,所以
df <- data.frame(`1` = c(1, 0.5, 1, 1, 1),
`2` = c(0.5, 0.5, 1, 1, 1),
`3` = c(0.5, 0.5, 0, 0, 0),
`4` = c(0L, 0L, 0L, 0L, 0L),
`5` = c(1L, 1L, 1L, 1L, 1L),
check.names = FALSE)
df[] <- Map(paste, names(df), df, sep = ':')
df
## 1 2 3 4 5
## 1 1:1 2:0.5 3:0.5 4:0 5:1
## 2 1:0.5 2:0.5 3:0.5 4:0 5:1
## 3 1:1 2:1 3:0 4:0 5:1
## 4 1:1 2:1 3:0 4:0 5:1
## 5 1:1 2:1 3:0 4:0 5:1
Here Map
takes the first element of names(df)
, ie 1
, and paste
s it to the first element of df
, ie the first column.这里
Map
获取names(df)
的第一个元素,即1
,并将其paste
到df
的第一个元素,即第一列。 Assigning to df[]
keeps the list's data.frame class, and therefore the original structure.分配给
df[]
保留列表的 data.frame 类,因此保留原始结构。
If your data is a matrix, you can do the same thing with sweep
:如果你的数据是一个矩阵,你可以用
sweep
做同样的事情:
mat <- matrix(c(1, 0.5, 1, 1, 1, 0.5, 0.5, 1, 1, 1, 0.5, 0.5, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1),
5, 5,
dimnames = list(c("1", "2", "3", "4", "5"),
c("1", "2", "3", "4", "5")))
mat[] <- sweep(mat, 2, colnames(df), function(x, y) paste(y, x, sep = ':'))
mat
## 1 2 3 4 5
## 1 "1:1" "2:0.5" "3:0.5" "4:0" "5:1"
## 2 "1:0.5" "2:0.5" "3:0.5" "4:0" "5:1"
## 3 "1:1" "2:1" "3:0" "4:0" "5:1"
## 4 "1:1" "2:1" "3:0" "4:0" "5:1"
## 5 "1:1" "2:1" "3:0" "4:0" "5:1"
As an alternative to looping, you can use col(., as.factor = TRUE)
to create a matrix of column names, then paste it to the data (coerced to matrix).作为循环的替代方法,您可以使用
col(., as.factor = TRUE)
创建列名矩阵,然后将其粘贴到数据(强制转换为矩阵)。
df[] <- paste(col(df, TRUE), as.matrix(df), sep = ":")
Resulting in:导致:
1 2 3 4 5 1 1:1 2:0.5 3:0.5 4:0 5:1 2 1:0.5 2:0.5 3:0.5 4:0 5:1 3 1:1 2:1 3:0 4:0 5:1 4 1:1 2:1 3:0 4:0 5:1 5 1:1 2:1 3:0 4:0 5:1
Actually, with these particular column names, as.factor = TRUE
is not necessary.实际上,对于这些特定的列名称,
as.factor = TRUE
。 But it would be necessary for column names not the same as the column numbers.但是列名与列号不同是必要的。 For this particular example, it could be
对于这个特定的例子,它可能是
df[] <- paste(col(df), as.matrix(df), sep = ":")
PS You should really be using a matrix with 100% numeric data, instead of a data frame. PS 您确实应该使用具有 100% 数字数据的矩阵,而不是数据框。
Data:数据:
df <- structure(list(`1` = c(1, 0.5, 1, 1, 1), `2` = c(0.5, 0.5, 1,
1, 1), `3` = c(0.5, 0.5, 0, 0, 0), `4` = c(0L, 0L, 0L, 0L, 0L
), `5` = c(1L, 1L, 1L, 1L, 1L)), .Names = c("1", "2", "3", "4",
"5"), class = "data.frame", row.names = c("1", "2", "3", "4",
"5"))
We can unlist
the dataset and paste
with replicated elements of the column name我们可以
unlist
数据集并paste
列名称的复制元素
df[] <- paste(names(df)[col(df)], unlist(df), sep=":")
df
# 1 2 3 4 5
#1 1:1 2:0.5 3:0.5 4:0 5:1
#2 1:0.5 2:0.5 3:0.5 4:0 5:1
#3 1:1 2:1 3:0 4:0 5:1
#4 1:1 2:1 3:0 4:0 5:1
#5 1:1 2:1 3:0 4:0 5:1
df <- structure(list(`1` = c(1, 0.5, 1, 1, 1), `2` = c(0.5, 0.5, 1,
1, 1), `3` = c(0.5, 0.5, 0, 0, 0), `4` = c(0L, 0L, 0L, 0L, 0L
), `5` = c(1L, 1L, 1L, 1L, 1L)), .Names = c("1", "2", "3", "4",
"5"), class = "data.frame", row.names = c("1", "2", "3", "4",
"5"))
To update this for tidyverse, you can now run要为 tidyverse 更新此内容,您现在可以运行
df <- map2_dfc(colnames(df), df, paste, sep = ':')
map2
takes 2 inputs for the paste function, and the _dfc
tag returns a dataframe as your result instead of a list. map2
为 paste 函数接受 2 个输入, _dfc
标签返回一个数据帧作为结果而不是列表。
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