How about > p_dates <- paste0(p.dates[[3]], "-", p.dates[[2]], "-", p.dates[[1]]) > myData$p_dates <- p_dates > print(myData, right=FALSE) dates p_dates 1 2017-10-01 1396-7-9 2 2017-10-02 1396-7-10 3 2017-10-03 1396-7-11 > str(myData) 'data.frame': 3 obs. of 2 variables: $ dates : Date, format: "2017-10-01" "2017-10-02" ... $ p_dates: chr "1396-7-9" "1396-7-10" "1396-7-11"
But p_dates is a character field so it will not work with numeric expressions: > with(myData, dates[3] - dates[1]) Time difference of 2 days # But > with(myData, p_dates[3] - p_dates[1]) Error in p_dates[3] - p_dates[1] : non-numeric argument to binary operator ----------------------------- David L. Carlson Department of Anthropology Texas A&M University -----Original Message----- From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Jeff Reichman Sent: Wednesday, November 8, 2017 5:05 PM To: r-help@r-project.org Subject: [R] Help Converting Calendars R-Help Trying to convert a Gregorian calendar dataset to a Persian calendar dataset. But I end up with a list and not sure what to do. For example ... dates <- c("2017-10-1","2017-10-2","2017-10-3") myData <- data.frame(dates) myData$dates <- as.Date(myData$dates, format = "%Y-%m-%d") > myData dates 1 2017-10-01 2 2017-10-02 3 2017-10-03 library(ConvCalendar) p.dates <- as.OtherDate(myData$dates,"persian") # after convering I get the following list > p.dates $day [1] 9 10 11 $month [1] 7 7 7 $year [1] 1396 1396 1396 attr(,"row.names") [1] 1 2 3 attr(,"class") [1] "OtherDate" attr(,"calendar") [1] "persian" How do I take that, to end up with dates p_dates 1 2017-10-01 1396-7-9 2 2017-10-02 1396-7-10 3 2017-10-03 1396-7-11 Jeff Reichman Penn State ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.