Hello,
I've cc-ed the list.
Yes, I believe that generally speaking, POSIXct is better than POSIXlt.
POSIXlt is a complicated structure, POSXct is much simpler and gives
less problems. Datetimes are a problem because they are datetimes but
POSIXct is a good way of trying to make things simpler. It's also the
class returned by packages like lubridate, functions ymd_hms and
similar. SO I think it's the prefered class for problems with datetime
variables.
Rui Barradas
Às 17:59 de 21/07/2020, Jeff Reichman escreveu:
Rui
So generally would it be better to us POSIXct than POSIXlt?
Jeff
-----Original Message-----
From: Rui Barradas <ruipbarra...@sapo.pt>
Sent: Tuesday, July 21, 2020 5:58 AM
To: reichm...@sbcglobal.net
Subject: Re: [R] Creating xts objects from csv file
Hello,
Why it didn't work I don't know but the opposite happens to me, I rarely use
as.POSIXlt.
This is because "POSIXlt" objects are complicated, list-like objects. Try
ct <- as.POSIXct("2020-07-21 12:30")
lt <- as.POSIXlt("2020-07-21 12:30")
attributes(ct)
unclass(ct)
attributes(lt)
unclass(lt)
POSIXlt objects can be usefull when their components are needed but many times
the problems are simple and the POSIXct class is simpler.
Rui Barradas
Às 00:40 de 21/07/2020, Jeff Reichman escreveu:
Rui
Yes that worked. I rarely if ever use the POSIXct function . Wonder why POSIXct
worded and POSIXlt didn't????
JEff
-----Original Message-----
From: Rui Barradas <ruipbarra...@sapo.pt>
Sent: Monday, July 20, 2020 4:37 PM
To: reichm...@sbcglobal.net; r-help@r-project.org
Subject: Re: [R] Creating xts objects from csv file
Hello,
I cannot reproduce the error, your code runs as expected. Try as.POSIXct?
Hope this helps,
Rui Barradas
Às 21:32 de 20/07/2020, Jeff Reichman escreveu:
R-Help Forum
Starting to work with xts objects but can't figure out what I'm doing
wrong when converting *.csv file with a dtg variable to a *.xts
object. When I'm converting to an appropriate time object all I get
are NA, so that's my first issue.
dtg <- c("1/5/2010 2:30", "1/5/2010 10:32", "1/5/2010 12:03")
seq <- c(1,2,3)
dat <- data.frame(dtg, seq)
dat$dtg <- as.POSIXlt(dat$dtg, format = "%m/%d/%Y %H:%M")
dat.xts <- xts(x = dat[,-1], order.by = dat[,1])
head(dat.xts)
Sincerely
Jeff Reichman
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