如何重命名data.frame中的单个列？

本文翻译自：How to rename a single column in a data.frame?

I know if I have a data frame with more than 1 column, I can use 我知道如果我有一个多于一列的数据框，我可以使用

colnames(x) <- c("col1","col2")

to rename the columns. 重命名列。 How do I do this if it's just one column? 如果只有一栏，该怎么办？ Meaning a vector or data frame with only one column in it. 表示其中仅包含一列的向量或数据帧。

Example: 例：

trSamp <- data.frame(sample(trainer$index, 10000)) head(trSamp ) # sample.trainer.index..10000. # 1 5907862 # 2 2181266 # 3 7368504 # 4 1949790 # 5 3475174 # 6 6062879 ncol(trSamp) # [1] 1 class(trSamp) # [1] "data.frame" class(trSamp[1]) # [1] "data.frame" class(trSamp[,1]) # [1] "numeric" colnames(trSamp)[2] <- "newname2" # Error in names(x) <- value : # 'names' attribute [2] must be the same length as the vector [1]

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#1楼

参考：https://stackoom.com/question/VbNk/如何重命名data-frame中的单个列

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#2楼

您也可以尝试从“ Hmisc”包中获取“ upData”。

library(Hmisc)

trSamp = upData(trSamp, rename=c(sample.trainer.index..10000. = 'newname2'))

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#3楼

This is a generalized way in which you do not have to remember the exact location of the variable: 这是一种通用的方式，您不必记住变量的确切位置：

# df = dataframe # old.var.name = The name you don't like anymore # new.var.name = The name you want to get names(df)[names(df) == 'old.var.name'] <- 'new.var.name'

This code pretty much does the following: 此代码几乎可以执行以下操作：

names(df) looks into all the names in the df names(df)的外观到在所有的名字df [names(df) == old.var.name] extracts the variable name you want to check [names(df) == old.var.name]提取您要检查的变量名 <- 'new.var.name' assigns the new variable name. <- 'new.var.name'分配新的变量名称。

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#4楼

This can also be done using Hadley's plyr package, and the rename function. 这也可以使用Hadley的plyr包和rename功能来完成。

library(plyr) df <- data.frame(foo=rnorm(1000)) df <- rename(df,c('foo'='samples'))

You can rename by the name (without knowing the position) and perform multiple renames at once. 您可以按名称重命名（不知道位置），并一次执行多个重命名。 After doing a merge, for example, you might end up with: 例如，进行合并后，您可能会得到以下结果：

letterid id.x id.y 1 70 2 1 2 116 6 5 3 116 6 4 4 116 6 3 5 766 14 9 6 766 14 13

Which you can then rename in one step using: 然后您可以使用以下步骤一步重命名：

letters <- rename(letters,c("id.x" = "source", "id.y" = "target")) letterid source target 1 70 2 1 2 116 6 5 3 116 6 4 4 116 6 3 5 766 14 9 6 766 14 13

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#5楼

This is an old question, but it is worth noting that you can now use setnames from the data.table package. 这是一个老问题，但值得注意的是，您现在可以使用setnames从data.table包。

library(data.table) setnames(DF, "oldName", "newName") # or since the data.frame in question is just one column: setnames(DF, "newName") # And for reference's sake, in general (more than once column) nms <- c("col1.name", "col2.name", etc...) setnames(DF, nms)

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#6楼

I like the next style for rename dataframe column names one by one. 我喜欢一种用于逐一重命名数据框列名称的样式。

colnames(df)[which(colnames(df) == 'old_colname')] <- 'new_colname'

where 哪里

which(colnames(df) == 'old_colname')

returns by the index of the specific column. 通过特定列的索引返回。