Hello,
Try
library(zoo) # needed for as.yearmon
x <- c(201009, 201010, 201011, 201101, 201102)
(y <- as.Date(paste(x, "01", sep=""), format="%Y%m%d"))
y - y[1]
12*(as.yearmon(y) - as.yearmon(y[1]))
Note that to have a time difference between dates we need days (paste).
Hope this helps,
Rui Barradas
Em 01-06-2012 12:31, Tammy Ma escreveu:
HI, R-Users:
I got a questions. have been struggling so long time....
I have this data:
m1$Year_Month
201009 201010 201011 201101 201102
min(m1$Year_Month)
201009
I want to calculate the following two answers, how do I program it?
difference in Month?????
[1] 0 1 2 4 5
difference in Days?????
0 31 61 ....
Thank you in advance!!!
Tammy
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