r

열이 두 개 이상인 데이터 프레임이 있으면 사용할 수 있습니다.

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

열 이름을 바꿉니다. 열이 하나 인 경우 어떻게해야합니까? 열이 하나 뿐인 벡터 또는 데이터 프레임을 의미합니다.

예:

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]

답변

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

colnames(trSamp) <- "newname2"

# 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'

colnames(df)[colnames(df) == 'oldName'] <- 'newName'

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)

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

  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

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

require(dplyr)
df = rename(df, new_col01 = old_col01, new_col02 = old_col02, ...)

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

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