如何在 data.frame 中重命名单个列？

Question

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")

来重命名列。 如果只有一栏我该怎么做？ 表示其中仅包含一列的向量或数据帧。

例如:

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]

转载于:https://stackoverflow.com/questions/7531868/how-to-rename-a-single-column-in-a-data-frame

Answer 1

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

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"