[R] Computing time differences
Dear R users, I have a problem computing time differences using R. I have a date that are given using the following format: 20080620.00, where the 4 first digits represent the year, the next 2 ones the month and the last 2 ones the day. I would need to compute time differences between two vectors of this given format. I tried around trying to change this format into any type of time serie without any succes. Could some one provide me with some useful suggestion and/or tip to know where to look? I am using R-2.4.0 under Windows XP Thanks for your help, Vincent [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch 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.
Re: [R] Computing time differences
Try this and see the help desk article in R News 4/1: x - 20080620.00 x2 - 20090218.00 num2Date - function(x) as.Date(paste(x), %Y%m%d) num2Date(x2) - num2Date(x) Time difference of 243 days as.numeric(num2Date(x2) - num2Date(x)) [1] 243 On 6/20/07, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Dear R users, I have a problem computing time differences using R. I have a date that are given using the following format: 20080620.00, where the 4 first digits represent the year, the next 2 ones the month and the last 2 ones the day. I would need to compute time differences between two vectors of this given format. I tried around trying to change this format into any type of time serie without any succes. Could some one provide me with some useful suggestion and/or tip to know where to look? I am using R-2.4.0 under Windows XP Thanks for your help, Vincent [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch 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. __ R-help@stat.math.ethz.ch 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.
Re: [R] Computing time differences
Here is one way: Vector1 - c(20080621.00,20080623.00) Vector2 - c(20080620.00,20080622.00) do.call(difftime, c(apply(cbind(time1=Vector1,time2=Vector2),2, function(x) strptime(x,format=%Y%m%d.00)), units=hours)) see ?strptime, ?difftime and http://cran.r-project.org/doc/Rnews/Rnews_2004-1.pdf --- [EMAIL PROTECTED] wrote: Dear R users, I have a problem computing time differences using R. I have a date that are given using the following format: 20080620.00, where the 4 first digits represent the year, the next 2 ones the month and the last 2 ones the day. I would need to compute time differences between two vectors of this given format. I tried around trying to change this format into any type of time serie without any succes. Could some one provide me with some useful suggestion and/or tip to know where to look? I am using R-2.4.0 under Windows XP Thanks for your help, Vincent [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch 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. Pinpoint customers who are looking for what you sell. __ R-help@stat.math.ethz.ch 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.
