R 데이터프레임 Datetime형 지정

1 개요[ | ]

R 데이터프레임 Datetime형 지정

2 문제상황[ | ]

df <- read.csv( header=T, stringsAsFactors=FALSE, text="
dt,fruit,ea
2019-06-01 1:00,apple,1
2019-06-11 2:00,apple,1
2019-06-21 3:00,banana,2
2019-07-01 4:00,apple,3
2019-07-11 5:00,banana,4
")
df
##                dt  fruit ea
## 1 2019-06-01 1:00  apple  1
## 2 2019-06-11 2:00  apple  1
## 3 2019-06-21 3:00 banana  2
## 4 2019-07-01 4:00  apple  3
## 5 2019-07-11 5:00 banana  4
class(df$dt)
## [1] "character"

3 방법: as.POSIXct() ★[ | ]

df$dt <- as.POSIXct(df$dt)
df
##                    dt  fruit ea
## 1 2019-06-01 01:00:00  apple  1
## 2 2019-06-11 02:00:00  apple  1
## 3 2019-06-21 03:00:00 banana  2
## 4 2019-07-01 04:00:00  apple  3
## 5 2019-07-11 05:00:00 banana  4
class(df$dt)
## [1] "POSIXct" "POSIXt"

4 같이 보기[ | ]