Re: [R] histogram of time-stamp data
On 16/07/2012, Rui Barradas ruipbarra...@sapo.pt wrote: Hello, Em 16-07-2012 22:45, e-letter escreveu: On 16/07/2012, r-help-requ...@r-project.org r-help-requ...@r-project.org wrote: -- Message: 77 Date: Mon, 16 Jul 2012 10:48:39 +0100 From: Rui Barradas ruipbarra...@sapo.pt To: e-letter inp...@gmail.com Cc: r-help@r-project.org Subject: Re: [R] histogram of time-stamp data Message-ID: 5003e377.3000...@sapo.pt Content-Type: text/plain; charset=ISO-8859-1; format=flowed timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) Why is it necessary to apply the sample to the current date? Looking at the dataframe, I noticed that values have been changed: No! That instruction is just to create a data example with more date/time values, in this case with a total of 1e3 different values. What's important is the way to plot the histogram, namely, the cut() with two example time periods, and that hist() needs numbers, not cut's levels. With the original data provided, R reports an error, that 'x' must be numeric'. __ 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] histogram of time-stamp data
Hello, That's not the error I've had. You must be aware that read.table creates a data.frame and therefore the object 'timestamps' is NOT holding time stamps, it's holding a vector, 'V1', of time stamps. timestamps - read.table(text= 12:19:00 09:30:00 16:56:00 01:56:00 10:44:00 10:31:00 02:14:00 05:05:00 12:52:00 21:50:00 , stringsAsFactors=FALSE) str(timestamps) timestamps - as.POSIXct(timestamps$V1, format=%H:%M:%S) # here h1 - cut(timestamps, breaks=hour) h2 - cut(timestamps, breaks=15 mins) op - par(mfrow=c(1, 2)) hist(as.integer(h1)) hist(as.integer(h2)) par(op) And the rest works. Rui Barradas Em 17-07-2012 07:11, e-letter escreveu: On 16/07/2012, Rui Barradas ruipbarra...@sapo.pt wrote: Hello, Em 16-07-2012 22:45, e-letter escreveu: On 16/07/2012, r-help-requ...@r-project.org r-help-requ...@r-project.org wrote: -- Message: 77 Date: Mon, 16 Jul 2012 10:48:39 +0100 From: Rui Barradas ruipbarra...@sapo.pt To: e-letter inp...@gmail.com Cc: r-help@r-project.org Subject: Re: [R] histogram of time-stamp data Message-ID: 5003e377.3000...@sapo.pt Content-Type: text/plain; charset=ISO-8859-1; format=flowed timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) Why is it necessary to apply the sample to the current date? Looking at the dataframe, I noticed that values have been changed: No! That instruction is just to create a data example with more date/time values, in this case with a total of 1e3 different values. What's important is the way to plot the histogram, namely, the cut() with two example time periods, and that hist() needs numbers, not cut's levels. With the original data provided, R reports an error, that 'x' must be numeric'. __ 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] histogram of time-stamp data
On 17/07/2012, Rui Barradas ruipbarra...@sapo.pt wrote: Hello, That's not the error I've had. You must be aware that read.table creates a data.frame and therefore the object 'timestamps' is NOT holding time stamps, it's holding a vector, 'V1', of time stamps. Was not aware of the significance of the data frame of vector values. ..., stringsAsFactors=FALSE) Can confirm the success of adding this parameter to the command 'read.table' timestamps - as.POSIXct(timestamps$V1, format=%H:%M:%S) # here h1 - cut(timestamps, breaks=hour) And the rest works. Confirmed, thanks. __ 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] histogram of time-stamp data
Readers, A data set consists of time-stamp values: 00:00:00 23:11:00 06:22:00 The data set was imported: timestamps-read.table(path/to/timestampsvalues) hist(timestamps) ...error... x must be numeric Then tried: plot(timestamps). How to adjust the graph to create a histogram where the intervals ranges can be specified, e.g. intervals of 60 minutes? Thanks in advance. __ 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] histogram of time-stamp data
pDates-as.POSIXct(times,format=%H:%M:%S) hist(pDates,hours) On 16.07.2012, at 10:47, e-letter wrote: Readers, A data set consists of time-stamp values: 00:00:00 23:11:00 06:22:00 The data set was imported: timestamps-read.table(path/to/timestampsvalues) hist(timestamps) ...error... x must be numeric Then tried: plot(timestamps). How to adjust the graph to create a histogram where the intervals ranges can be specified, e.g. intervals of 60 minutes? Thanks in advance. __ 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. [[alternative HTML version deleted]] __ 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] histogram of time-stamp data
Hello, Try the following. timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) h1 - cut(timestamps, breaks=hour) h2 - cut(timestamps, breaks=15 mins) op - par(mfrow=c(1, 2)) hist(as.integer(h1)) hist(as.integer(h2)) par(op) Hope this helps, Rui Barradas Em 16-07-2012 09:47, e-letter escreveu: Readers, A data set consists of time-stamp values: 00:00:00 23:11:00 06:22:00 The data set was imported: timestamps-read.table(path/to/timestampsvalues) hist(timestamps) ...error... x must be numeric Then tried: plot(timestamps). How to adjust the graph to create a histogram where the intervals ranges can be specified, e.g. intervals of 60 minutes? Thanks in advance. __ 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] histogram of time-stamp data
On 16/07/2012, r-help-requ...@r-project.org r-help-requ...@r-project.org wrote: -- Message: 77 Date: Mon, 16 Jul 2012 10:48:39 +0100 From: Rui Barradas ruipbarra...@sapo.pt To: e-letter inp...@gmail.com Cc: r-help@r-project.org Subject: Re: [R] histogram of time-stamp data Message-ID: 5003e377.3000...@sapo.pt Content-Type: text/plain; charset=ISO-8859-1; format=flowed timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) Why is it necessary to apply the sample to the current date? Looking at the dataframe, I noticed that values have been changed: file 'test.txt': 12:19:00 09:30:00 16:56:00 01:56:00 10:44:00 10:31:00 02:14:00 05:05:00 12:52:00 21:50:00 R command terminal input: timestamps-read.table(test.txt) timestamps V1 1 12:19:00 2 09:30:00 3 16:56:00 4 01:56:00 5 10:44:00 6 10:31:00 7 02:14:00 8 05:05:00 9 12:52:00 10 21:50:00 timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) write.csv(timestamps,file=test1.txt) test1.txt: ,x 1,2012-07-16 04:52:48 2,2012-07-16 21:21:28 3,2012-07-16 18:58:27 4,2012-07-16 22:17:25 5,2012-07-16 11:13:52 6,2012-07-16 03:17:35 7,2012-07-16 02:14:17 8,2012-07-16 14:18:27 9,2012-07-16 14:39:16 Why is this happening? __ 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] histogram of time-stamp data
Hello, Em 16-07-2012 22:45, e-letter escreveu: On 16/07/2012, r-help-requ...@r-project.org r-help-requ...@r-project.org wrote: -- Message: 77 Date: Mon, 16 Jul 2012 10:48:39 +0100 From: Rui Barradas ruipbarra...@sapo.pt To: e-letter inp...@gmail.com Cc: r-help@r-project.org Subject: Re: [R] histogram of time-stamp data Message-ID: 5003e377.3000...@sapo.pt Content-Type: text/plain; charset=ISO-8859-1; format=flowed timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) Why is it necessary to apply the sample to the current date? Looking at the dataframe, I noticed that values have been changed: No! That instruction is just to create a data example with more date/time values, in this case with a total of 1e3 different values. What's important is the way to plot the histogram, namely, the cut() with two example time periods, and that hist() needs numbers, not cut's levels. Rui Barradas file 'test.txt': 12:19:00 09:30:00 16:56:00 01:56:00 10:44:00 10:31:00 02:14:00 05:05:00 12:52:00 21:50:00 R command terminal input: timestamps-read.table(test.txt) timestamps V1 1 12:19:00 2 09:30:00 3 16:56:00 4 01:56:00 5 10:44:00 6 10:31:00 7 02:14:00 8 05:05:00 9 12:52:00 10 21:50:00 timestamps - as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE) write.csv(timestamps,file=test1.txt) test1.txt: ,x 1,2012-07-16 04:52:48 2,2012-07-16 21:21:28 3,2012-07-16 18:58:27 4,2012-07-16 22:17:25 5,2012-07-16 11:13:52 6,2012-07-16 03:17:35 7,2012-07-16 02:14:17 8,2012-07-16 14:18:27 9,2012-07-16 14:39:16 Why is this happening? __ 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.
