Extracting day of month from Date objects
I've always found the chron library to be useful for tasks like this:
x <- round(runif(10)*100000, digits=0) y <- as.Date(x, origin="1970-01-01") library(chron) days(y)
[1] 7 25 26 25 10 24 1 31 12 8 31 Levels: 1 < 2 < 3 < 4 < 5 < 6 < 7 < 8 < 9 < 10 < 11 < 12 < 13 < ... < 31 Notice that it returns the days as factors. - Phil Spector Statistical Computing Facility Department of Statistics UC Berkeley
On May 24, 2011, at 10:19 AM, Kang Min wrote:
I have another question - I'd like to extract dates from a vector of yyyy-mm-dd, so I just want the dd. x <- round(runif(10)*100000, digits=0) y <- as.Date(x, origin="1970-01-01") I tried this based on the code that Jim provided, but it just printed the whole date. I think I just need to tweak it a little, but haven't been able to figure it out.