[R] NA instead of time stamp
arun
smartpink111 at yahoo.com
Tue Jul 17 19:27:41 CEST 2012
Hello,
I think there is some mistake in the format.
Try this:
dat1<-data.frame(Year=rep(2009,2),Month=rep(10,2),Day=rep(5,2),hour=rep(0,2),minute=c(0,15),second=c(11.288,11.258))
###Your code
DateTime<-with(dat1,paste(Year,Month,Day,hour,minute))
DateTime
#[1] "2009 10 5 0 0" "2009 10 5 0 15"
DateTime1<-as.POSIXct(DateTime,format="%m/%d/Y %H:%M")
DateTime1
#[1] NA NA
######Corrected one
DateTime<-with(dat1,paste(Year,Month,Day,hour,minute,sep="/"))
DateTime1<-as.POSIXct(DateTime,format="%Y/%m/%d/%H/%M")
DateTime1
#[1] "2009-10-05 00:00:00 EDT" "2009-10-05 00:15:00 EDT"
A.K.
----- Original Message -----
From: Yolande Tra <yolande.tra at gmail.com>
To: r-help at r-project.org
Cc:
Sent: Tuesday, July 17, 2012 10:48 AM
Subject: [R] NA instead of time stamp
I was wondering why I get <NA> instead of the timestamp in the following.
Thanks.
> dataDir <- file.path(wd)
> localRaw <- read.csv(file.path(dataDir,"LOCAL.csv"), as.is=T,stringsAsFactors
= FALSE)
> localRaw[1:2,]
Year Month Day hour minute second Temp1mab Temp7mab Temp14mab Salinity1mab
1 2009 10 5 0 0 0 11.288 13.675 13.743 33.513
2 2009 10 5 0 15 0 11.258 13.684 13.716 33.514
O21mab waveht wavedir waveperiod depth mab along across
1 0 54.926 1.600 340 9.09 . NA NA
2 0 55.574 1.525 340 9.09 . NA NA
> DateTime<-with(localRaw,paste(Year,Month,Day,hour,minute))
> DateTime<-as.POSIXct(DateTime, format="%m/%d/%Y %H:%M")
> localCond_2009<-xts(localRaw ,order.by=DateTime)
> localCond_2009[1:2,]
Year Month Day hour minute second Temp1mab Temp7mab Temp14mab
<NA> "2009" "10" " 5" " 0" " 0" "0" "11.288" "13.675" "13.743"
<NA> "2009" "10" " 5" " 0" "15" "0" "11.258" "13.684" "13.716"
Salinity1mab O21mab waveht wavedir waveperiod depth mab along
across
<NA> "33.513" "0" "54.926" "1.600" "340.0" " 9.090" "." NA
NA
<NA> "33.514" "0" "55.574" "1.525" "340.0" " 9.090" "." NA
NA
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