如何重命名 data.frame 中的单个列?

本文介绍了如何重命名 data.frame 中的单个列?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

我知道如果我有一个多于 1 列的数据框，我可以使用

I know if I have a data frame with more than 1 column, I can use

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

重命名列.如果它只是一列，我该怎么做?表示只有一列的向量或数据框.

to rename the columns. How do I do this if it's just one column? Meaning a vector or data frame with only one column in it.

示例:

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]

推荐答案

colnames(trSamp)[2] <- "newname2"

尝试设置第二列的名称.您的对象只有一列，因此该命令会引发错误.这应该足够了:

attempts to set the second column's name. Your object only has one column, so the command throws an error. This should be sufficient:

colnames(trSamp) <- "newname2"