r - How do I combine two columns into one? -


i stuck combining 2 columns of data frame one. below code reproduce problem

df <- data.frame(date = c("2/13/1962 0:00:00", "4/13/1972 0:00:00", "3/13/1982 0:00:00", "12/13/1992 0:00:00"),                   time = c("0900", "1000", "1101", "1603"))  #this works df$tmp <- as.date(df$date, format="%m/%d/%y") df                    date     time        tmp       1  2/13/1962 0:00:00 0900 1962-02-13       2  4/13/1972 0:00:00 1000 1972-04-13       3  3/13/1982 0:00:00 1101 1982-03-13       4 12/13/1992 0:00:00 1603 1992-12-13       # doesn't df$tmp <- strptime(strsplit(as.character(df$date), " ")[[1]][1], format="%m/%d/%y") df      1  2/13/1962 0:00:00 0900 1962-02-13     2  4/13/1972 0:00:00 1000 1962-02-13     3  3/13/1982 0:00:00 1101 1962-02-13     4 12/13/1992 0:00:00 1603 1962-02-13

i end column combines date part of date , time column unable result.

while experimenting noticed as.date function convert date . on other hand, strsplit function rows end first date.

i appreciate towards solution, ending 4 rows have "date" object:

    1 1962-02-13 09:00     2 1972-04-13 10:00     3 1982-03-13 11:01     4 1992-12-13 16:03

you may paste date , time variable, , use as.posixct appropriate format:

as.posixct(x = paste(as.date(df$date, format = "%m/%d/%y"), df$time),            format = "%y-%m-%d %h%m")

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