Hi,
You could try:
day<-as.Date(c("2008-04-12","2011-07-02","2011-09-02","2008-04-12","2008-04-12"))
indx<-gsub("-.*","",day)
day[indx>="2007" & indx<="2009"]
#[1] "2008-04-12" "2008-04-12" "2008-04-12"
#or
library(xts)
xt1<- xts(seq_along(day),day)
index(xt1["2007/2009"])
#[1] "2008-04-12" "2008-04-12" "2008-04-12"
#or
library(chron)
yr1<-month.day.year(unclass(day))$year
day[yr1>=2007 & yr1<=2009]
#[1] "2008-04-12" "2008-04-12" "2008-04-12"
A.K.
----- Original Message -----
From: Gallon Li <gallon...@gmail.com>
To: r-help <r-h...@stat.math.ethz.ch>
Cc:
Sent: Thursday, July 4, 2013 2:31 AM
Subject: [R] how to choose dates data?
i have converted my data into date format like below:
> day=as.Date(originaldate,"%m/%d/%Y")
> day[1:5]
[1] "2008-04-12" "2011-07-02" "2011-09-02" "2008-04-12" "2008-04-12"
I wish to select only those observations from 2007 to 2009, how can I
select from this list?
[[alternative HTML version deleted]]
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