Re: [R] How to group data by day
Many thanks Mikhail, aggregate() is fine! Il 14/02/2011 20.42, Mikhail Titov ha scritto: It depends what would you like to get at the end. Perhaps you don't necessary need this type of numbering. For instance, if you'd like to calculate daily average. london$id- as.Date(london$id) For sum by day you could use, let's say, this aggregate(words~id,london,FUN=sum) If you really want what you've asked: london$one=1 u=unique(london$id) z=aggregate(one~id,london,FUN=sum) london$day=rep(seq(along.with=z$one),z$one) Mikhail -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- project.org] On Behalf Of Michela Ferron Sent: Monday, February 14, 2011 11:09 AM To: r-help@r-project.org Subject: [R] How to group data by day Hi everybody, I'm a beginner in R and I'm having a hard time grouping my data by day. The data are in this format: id; words 2005-07-07T09:59:56Z; 35 2005-07-07T10:01:39Z; 13 2005-07-08T10:02:22Z; 1 2005-07-09T10:03:16Z; 23 2005-07-10T10:04:23Z; 39 2005-07-10T10:04:39Z; 15 I've transformed the date strings in dates with the function: london$id- transform(london$id, as.Date(london$id, format=%Y-%m- %d%T%H:%M:%S%Z)) and it seems to work. Now I would like to add a new day variable to group data by day, like this: id; words; day 2005-07-07T09:59:56Z; 35; 1 2005-07-07T10:01:39Z; 13; 1 2005-07-08T10:02:22Z; 1; 2 2005-07-09T10:03:16Z; 23; 3 2005-07-10T10:04:23Z; 39; 4 2005-07-10T10:04:39Z; 15; 4 How can I do that? Many thanks! Michela __ 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.
[R] How to group data by day
Hi everybody, I'm a beginner in R and I'm having a hard time grouping my data by day. The data are in this format: id; words 2005-07-07T09:59:56Z; 35 2005-07-07T10:01:39Z; 13 2005-07-08T10:02:22Z; 1 2005-07-09T10:03:16Z; 23 2005-07-10T10:04:23Z; 39 2005-07-10T10:04:39Z; 15 I've transformed the date strings in dates with the function: london$id - transform(london$id, as.Date(london$id, format=%Y-%m-%d%T%H:%M:%S%Z)) and it seems to work. Now I would like to add a new day variable to group data by day, like this: id; words; day 2005-07-07T09:59:56Z; 35; 1 2005-07-07T10:01:39Z; 13; 1 2005-07-08T10:02:22Z; 1; 2 2005-07-09T10:03:16Z; 23; 3 2005-07-10T10:04:23Z; 39; 4 2005-07-10T10:04:39Z; 15; 4 How can I do that? Many thanks! Michela __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to group data by day
It depends what would you like to get at the end. Perhaps you don't necessary need this type of numbering. For instance, if you'd like to calculate daily average. london$id - as.Date(london$id) For sum by day you could use, let's say, this aggregate(words~id,london,FUN=sum) If you really want what you've asked: london$one=1 u=unique(london$id) z=aggregate(one~id,london,FUN=sum) london$day=rep(seq(along.with=z$one),z$one) Mikhail -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- project.org] On Behalf Of Michela Ferron Sent: Monday, February 14, 2011 11:09 AM To: r-help@r-project.org Subject: [R] How to group data by day Hi everybody, I'm a beginner in R and I'm having a hard time grouping my data by day. The data are in this format: id; words 2005-07-07T09:59:56Z; 35 2005-07-07T10:01:39Z; 13 2005-07-08T10:02:22Z; 1 2005-07-09T10:03:16Z; 23 2005-07-10T10:04:23Z; 39 2005-07-10T10:04:39Z; 15 I've transformed the date strings in dates with the function: london$id - transform(london$id, as.Date(london$id, format=%Y-%m- %d%T%H:%M:%S%Z)) and it seems to work. Now I would like to add a new day variable to group data by day, like this: id; words; day 2005-07-07T09:59:56Z; 35; 1 2005-07-07T10:01:39Z; 13; 1 2005-07-08T10:02:22Z; 1; 2 2005-07-09T10:03:16Z; 23; 3 2005-07-10T10:04:23Z; 39; 4 2005-07-10T10:04:39Z; 15; 4 How can I do that? Many thanks! Michela __ 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.
