I would like to import only datas of my table where DATE>today-7days. But my datas in Oracle are 'dates' and in R are 'characters'. now_7<-format(Sys.time()-(7*60*60*24), "%Y-%m-%d 00:00:00") How to do? -- View this message in context: http://r.789695.n4.nabble.com/Compare-date-Oracle-with-Sys-time-tp4635624.html Sent from the R help mailing list archive at Nabble.com.
Hello, Not quite understand about ur problem.? Could you dput your data? The below should be general format to convert to class date ?now_7<-format(Sys.time()-(7*60*60*24), "%Y-%m-%d 00:00:00")> now_7[1] "2012-06-29 00:00:00"> class(now_7)[1] "character" now_7_new<-as.Date(Sys.time()-(7*60*60*24), format="%Y-%m-%d %H:%M:%S")> now_7_new[1] "2012-06-29"> class(now_7_new)[1] "Date" A.K. ----- Original Message ----- From: cindy.dol <cindy.dolomieu at insa-lyon.fr> To: r-help at r-project.org Cc: Sent: Friday, July 6, 2012 11:50 AM Subject: [R] Compare date Oracle with Sys.time I would like to import only datas of my table where DATE>today-7days. But my datas in Oracle are 'dates' and in R are 'characters'. now_7<-format(Sys.time()-(7*60*60*24), "%Y-%m-%d 00:00:00") How to do? -- View this message in context: http://r.789695.n4.nabble.com/Compare-date-Oracle-with-Sys-time-tp4635624.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
On Jul 6, 2012, at 10:50 AM, cindy.dol wrote:> I would like to import only datas of my table where DATE>today-7days. > But my datas in Oracle are 'dates' and in R are 'characters'. > now_7<-format(Sys.time()-(7*60*60*24), "%Y-%m-%d 00:00:00") > How to do?Huh? How are you getting the data from Oracle into R? Typically Oracle DATE/TIMESTAMP data types come over as ?POSIXct in R, if using facilities such as RODBC, which means using a regular date based comparison. Use: str(DF) where 'DF' is your data frame, to review the structure of it. If your data frame is called DF and your date/time column is called MyDATE, you can use as.Date() to coerce both to ?Date class and then do the subtraction with days as the unit of measurement: NewDF <- subset(DF, as.Date(Sys.time()) - as.Date(MyDATE) < 7) If for some reason, you are importing your data via another means into R, then you can still use ?as.Date to coerce the column to a Date class and use the above incantation. See ?subset for additional information on that function. Regards, Marc Schwartz
Hello,
On further thinking about the issue, I guess this may be close to what you are
looking for:
date1<-c("2012-06-12","2012-06-13","2012-06-14","2012-06-27","2012-07-01","2012-07-02","2012-07-03","2012-07-04")
?class(date1)
[1] "character"
#converting to date class
date2<-as.Date(date1,format="%Y-%m-%d")
class(date2)
[1] "Date"
date3<-as.data.frame(date2)
colnames(date3)<-"date"
difft<- difftime(Sys.time(),date3[,1])>=7
date3[difft,]
[1] "2012-06-12" "2012-06-13" "2012-06-14"
"2012-06-27"> class(date3[difft,] )
[1] "Date"
A.K.
----- Original Message -----
From: cindy.dol <cindy.dolomieu at insa-lyon.fr>
To: r-help at r-project.org
Cc:
Sent: Friday, July 6, 2012 11:50 AM
Subject: [R] Compare date Oracle with Sys.time
I would like to import only datas of my table where DATE>today-7days.
But my datas in Oracle are 'dates' and in R are 'characters'.
now_7<-format(Sys.time()-(7*60*60*24), "%Y-%m-%d 00:00:00")
How to do?
--
View this message in context:
http://r.789695.n4.nabble.com/Compare-date-Oracle-with-Sys-time-tp4635624.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.