[R] ifelse strips POSIXct class from object
Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? my.date = as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) (if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date) + x ) On my machine, new.date is numeric whereas new.date2 is POSIXct and POSIXt, as desired. sessionInfo() R version 2.13.0 (2011-04-13) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base Thanks in advance, Denis __ R-help@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.
Re: [R] ifelse strips POSIXct class from object
On 11-06-05 8:23 AM, Denis Chabot wrote: Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? See ?ifelse. The class of the result is the same as the class of the test, not the classes of the alternatives. You need to manually attach the class again, or use a different construction. Duncan Murdoch my.date = as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) (if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date) + x ) On my machine, new.date is numeric whereas new.date2 is POSIXct and POSIXt, as desired. sessionInfo() R version 2.13.0 (2011-04-13) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base Thanks in advance, Denis __ R-help@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. __ R-help@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.
Re: [R] ifelse strips POSIXct class from object
On Sun, Jun 5, 2011 at 8:23 AM, Denis Chabot chabot.de...@gmail.com wrote: Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? my.date = as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) Try replace: new.date - replace(my.date, is.na(my.date), min(default.date)) + x -- Statistics Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com __ R-help@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.
Re: [R] ifelse strips POSIXct class from object
Thanks Duncan, I'll go back to if and else! Denis Le 2011-06-05 à 08:39, Duncan Murdoch a écrit : On 11-06-05 8:23 AM, Denis Chabot wrote: Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? See ?ifelse. The class of the result is the same as the class of the test, not the classes of the alternatives. You need to manually attach the class again, or use a different construction. Duncan Murdoch my.date = as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) (if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date) + x ) On my machine, new.date is numeric whereas new.date2 is POSIXct and POSIXt, as desired. sessionInfo() R version 2.13.0 (2011-04-13) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base Thanks in advance, Denis __ R-help@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. __ R-help@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.
Re: [R] ifelse strips POSIXct class from object
I did not know this function, thanks a lot Gabor. Denis Le 2011-06-05 à 08:48, Gabor Grothendieck a écrit : On Sun, Jun 5, 2011 at 8:23 AM, Denis Chabot chabot.de...@gmail.com wrote: Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? my.date = as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) Try replace: new.date - replace(my.date, is.na(my.date), min(default.date)) + x -- Statistics Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com __ R-help@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.
Re: [R] ifelse strips POSIXct class from object
On 11-06-05 8:49 AM, Denis Chabot wrote: Thanks Duncan, I'll go back to if and else! Be careful, it might not give you the same answer. I'd use this variation on the advice from ?ifelse: new.date - my.date + x new.date[is.na(my.date)] - min(default.date) + x The thing to watch out for in this construction is that the lengths of the vectors come out right. I'm assuming that my.date + x is the same length as is.na(my.date)], and that min(default.date) + x is length 1, but I haven't tried your code to check. Duncan Murdoch Denis Le 2011-06-05 à 08:39, Duncan Murdoch a écrit : On 11-06-05 8:23 AM, Denis Chabot wrote: Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? See ?ifelse. The class of the result is the same as the class of the test, not the classes of the alternatives. You need to manually attach the class again, or use a different construction. Duncan Murdoch my.date = as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) (if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date) + x ) On my machine, new.date is numeric whereas new.date2 is POSIXct and POSIXt, as desired. sessionInfo() R version 2.13.0 (2011-04-13) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base Thanks in advance, Denis __ R-help@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. __ R-help@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.
Re: [R] ifelse strips POSIXct class from object
Hi Duncan, In this case they all had length 1, but I'll be careful at other occasions. Denis Le 2011-06-05 à 09:26, Duncan Murdoch a écrit : On 11-06-05 8:49 AM, Denis Chabot wrote: Thanks Duncan, I'll go back to if and else! Be careful, it might not give you the same answer. I'd use this variation on the advice from ?ifelse: new.date - my.date + x new.date[is.na(my.date)] - min(default.date) + x The thing to watch out for in this construction is that the lengths of the vectors come out right. I'm assuming that my.date + x is the same length as is.na(my.date)], and that min(default.date) + x is length 1, but I haven't tried your code to check. Duncan Murdoch Denis Le 2011-06-05 à 08:39, Duncan Murdoch a écrit : On 11-06-05 8:23 AM, Denis Chabot wrote: Hi, I was losing my dates in a script and upon inspection, found that my recent switch from separate if and else to ifelse was the cause. But why? See ?ifelse. The class of the result is the same as the class of the test, not the classes of the alternatives. You need to manually attach the class again, or use a different construction. Duncan Murdoch my.date= as.POSIXct(2011-06-04 08:00:00) default.date = seq(as.POSIXct(2011-01-01 08:00:00), as.POSIXct(2011-09-01 08:00:00), length=15) x = 4 * 60 * 60 (my.date + x) (min(default.date) + x) (new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) ) (if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date) + x) On my machine, new.date is numeric whereas new.date2 is POSIXct and POSIXt, as desired. sessionInfo() R version 2.13.0 (2011-04-13) Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) locale: [1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base Thanks in advance, Denis __ R-help@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. __ R-help@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.
