Re: [R] Computing row differences in new columns
-Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: roberto.mul...@doctor.com Sent: Mon, Mar 21, 2011 3:37 pm Subject: Re: [R] Computing row differences in new columns Sorry, my data appeared badly formatted to me, so I converted it to plain text: And just to clarify, for each subject in the first row it should appear the difference to the next row, so that the last entry on each subject would be a NA. Thanks again for your help Roberto SUBJECTDATE RESULT DateDiff ResultDiff 10751 22-Jul-03 3.5 10751 13-Feb-04 1.3 10751 20-Aug-04 1.6 10751 08-Mar-05 1.7 10751 30-Aug-05 1.6 10751 21-Feb-06 1.3 10751 31-Aug-06 1.2 10751 27-Feb-07 1.5 10751 29-Aug-07 1 10752 29-Jul-03 5.9 10752 24-Feb-04 5 10752 25-Aug-04 3.6 10752 11-Mar-05 5.1 10752 18-Sep-05 2.2 10752 23-Feb-06 3.1 10752 24-Aug-06 3.7 10752 27-Feb-07 6 -Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: r-help@r-project.org Sent: Mon, Mar 21, 2011 3:23 pm Subject: [R] Computing row differences in new columns i I have the following columns with dates and results, sorted by subject and date. 'd like to compute the differences in dates and results for each patient, based n the previous row. Obviously the last entry for each subject should be a NA. Which would be the best way to accomplished that ? I guess questions like that have been already answered a thousand times, so I pologize for asking one more time. Thanks Roberto SUBJECT ate esult ateDiff esultDiff 10751 2-Jul-03 .5 0751 3-Feb-04 .3 10751 0-Aug-04 .6 10751 8-Mar-05 .7 10751 0-Aug-05 .6 10751 1-Feb-06 .3 10751 1-Aug-06 .2 10751 7-Feb-07 .5 10751 9-Aug-07 10752 9-Jul-03 .9 10752 4-Feb-04 10752 5-Aug-04 .6 10752 1-Mar-05 .1 10752 8-Sep-05 .2 10752 3-Feb-06 .1 10752 4-Aug-06 .7 10752 7-Feb-07 [[alternative HTML version deleted]] __ -h...@r-project.org mailing list ttps://stat.ethz.ch/mailman/listinfo/r-help LEASE do read the posting guide http://www.R-project.org/posting-guide.html nd 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] Computing row differences in new columns
(mods: can you un-flag me if I am still flagged?)
Hi,
First, I would convert the DATE column to an integer. I found this by
quick googling, perhaps as.Date is your weapon of choice:
https://stat.ethz.ch/pipermail/r-help/2008-August/169870.html
For the column generation I think you will have to use a for-loop here:
yourdata$ResultDiff - 0
yourdata$DateDiff - 0
for( i in 1:nrow(yourdata) ){
yourdata$ResultDiff[i] - yourdata$RESULT[i] - yourdata$RESULT[i+1] #
should automatically NA the last cell
yourdata$DateDiff[i] - yourdata$datenumber[i] -
yourdata$datenumber[i+1]
}
where datenumber is your integer column of the date.
-- Alex
Am 21.03.2011 20:38, schrieb Roberto Lodeiro Muller:
-Original Message-
From: Roberto Lodeiro Mullerroberto.mul...@doctor.com
To: roberto.mul...@doctor.com
Sent: Mon, Mar 21, 2011 3:37 pm
Subject: Re: [R] Computing row differences in new columns
Sorry, my data appeared badly formatted to me, so I converted it to plain text:
And just to clarify, for each subject in the first row it should appear the
difference to the next row, so that the last entry on each subject would be a
NA.
Thanks again for your help
Roberto
SUBJECTDATE RESULT DateDiff ResultDiff
10751 22-Jul-03 3.5
10751 13-Feb-04 1.3
10751 20-Aug-04 1.6
10751 08-Mar-05 1.7
10751 30-Aug-05 1.6
10751 21-Feb-06 1.3
10751 31-Aug-06 1.2
10751 27-Feb-07 1.5
10751 29-Aug-07 1
10752 29-Jul-03 5.9
10752 24-Feb-04 5
10752 25-Aug-04 3.6
10752 11-Mar-05 5.1
10752 18-Sep-05 2.2
10752 23-Feb-06 3.1
10752 24-Aug-06 3.7
10752 27-Feb-07 6
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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 row differences in new columns
Hi: Here's one way. Calling your data frame below d, # Function to compute consecutive differences dif - function(x) c(diff(x), NA) # Make sure that DATE is a Date variable d$DATE - as.Date(d$DATE, format = '%d-%b-%y') # Apply the function to each individual ddply(d, 'SUBJECT', transform, diffDate = dif(DATE), diffResult = dif(RESULT)) SUBJECT DATE RESULT diffDate diffResult 110751 2003-07-223.5 206 -2.2 210751 2004-02-131.3 1890.3 310751 2004-08-201.6 2000.1 410751 2005-03-081.7 175 -0.1 510751 2005-08-301.6 175 -0.3 610751 2006-02-211.3 191 -0.1 710751 2006-08-311.2 1800.3 810751 2007-02-271.5 183 -0.5 910751 2007-08-291.0 NA NA 10 10752 2003-07-295.9 210 -0.9 11 10752 2004-02-245.0 183 -1.4 12 10752 2004-08-253.6 1981.5 13 10752 2005-03-115.1 191 -2.9 14 10752 2005-09-182.2 1580.9 15 10752 2006-02-233.1 1820.6 16 10752 2006-08-243.7 1872.3 17 10752 2007-02-276.0 NA NA If you want the NA first (which is reasonable), flip the NA and diff(x) in the function definition. HTH, Dennis On Mon, Mar 21, 2011 at 12:38 PM, Roberto Lodeiro Muller roberto.mul...@doctor.com wrote: -Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: roberto.mul...@doctor.com Sent: Mon, Mar 21, 2011 3:37 pm Subject: Re: [R] Computing row differences in new columns Sorry, my data appeared badly formatted to me, so I converted it to plain text: And just to clarify, for each subject in the first row it should appear the difference to the next row, so that the last entry on each subject would be a NA. Thanks again for your help Roberto SUBJECTDATE RESULT DateDiff ResultDiff 10751 22-Jul-03 3.5 10751 13-Feb-04 1.3 10751 20-Aug-04 1.6 10751 08-Mar-05 1.7 10751 30-Aug-05 1.6 10751 21-Feb-06 1.3 10751 31-Aug-06 1.2 10751 27-Feb-07 1.5 10751 29-Aug-07 1 10752 29-Jul-03 5.9 10752 24-Feb-04 5 10752 25-Aug-04 3.6 10752 11-Mar-05 5.1 10752 18-Sep-05 2.2 10752 23-Feb-06 3.1 10752 24-Aug-06 3.7 10752 27-Feb-07 6 -Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: r-help@r-project.org Sent: Mon, Mar 21, 2011 3:23 pm Subject: [R] Computing row differences in new columns i I have the following columns with dates and results, sorted by subject and date. 'd like to compute the differences in dates and results for each patient, based n the previous row. Obviously the last entry for each subject should be a NA. Which would be the best way to accomplished that ? I guess questions like that have been already answered a thousand times, so I pologize for asking one more time. Thanks Roberto SUBJECT ate esult ateDiff esultDiff 10751 2-Jul-03 .5 0751 3-Feb-04 .3 10751 0-Aug-04 .6 10751 8-Mar-05 .7 10751 0-Aug-05 .6 10751 1-Feb-06 .3 10751 1-Aug-06 .2 10751 7-Feb-07 .5 10751 9-Aug-07 10752 9-Jul-03 .9 10752 4-Feb-04 10752 5-Aug-04 .6 10752 1-Mar-05 .1 10752 8-Sep-05 .2 10752 3-Feb-06 .1 10752 4-Aug-06 .7 10752 7-Feb-07 [[alternative HTML version deleted]] __ -h...@r-project.org mailing list ttps://stat.ethz.ch/mailman/listinfo/r-help LEASE do read the posting guide http://www.R-project.org/posting-guide.html nd 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. [[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] Computing row differences in new columns
On Mar 21, 2011, at 3:38 PM, Roberto Lodeiro Muller wrote: -Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: roberto.mul...@doctor.com Sent: Mon, Mar 21, 2011 3:37 pm Subject: Re: [R] Computing row differences in new columns Sorry, my data appeared badly formatted to me, so I converted it to plain text: And just to clarify, for each subject in the first row it should appear the difference to the next row, so that the last entry on each subject would be a NA. Thanks again for your help Roberto SUBJECTDATE RESULT DateDiff ResultDiff 10751 22-Jul-03 3.5 10751 13-Feb-04 1.3 10751 20-Aug-04 1.6 10751 08-Mar-05 1.7 10751 30-Aug-05 1.6 10751 21-Feb-06 1.3 10751 31-Aug-06 1.2 10751 27-Feb-07 1.5 10751 29-Aug-07 1 10752 29-Jul-03 5.9 10752 24-Feb-04 5 10752 25-Aug-04 3.6 10752 11-Mar-05 5.1 10752 18-Sep-05 2.2 10752 23-Feb-06 3.1 10752 24-Aug-06 3.7 10752 27-Feb-07 6 dat$dt - as.Date(dat$DATE, format=%d-%b-%y) dat$diffdt - c(diff(dat$dt), NA) dat$diffRES - c(diff(dat$RES), NA) -- David Winsemius, MD Heritage Laboratories West Hartford, CT __ 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] Computing row differences in new columns
Try this: dat$DATE - as.Date(dat$DATE, %d-%b-%y) dat - cbind(dat, lapply(mapply(tapply, MoreArgs = list(INDEX = c(dat$SUBJECT, unique(dat$SUBJECT)), FUN = diff), lapply(dat[,2:3], c, unique(dat$SUBJECT) / NA), SIMPLIFY = FALSE), unlist)) On Mon, Mar 21, 2011 at 4:38 PM, Roberto Lodeiro Muller roberto.mul...@doctor.com wrote: -Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: roberto.mul...@doctor.com Sent: Mon, Mar 21, 2011 3:37 pm Subject: Re: [R] Computing row differences in new columns Sorry, my data appeared badly formatted to me, so I converted it to plain text: And just to clarify, for each subject in the first row it should appear the difference to the next row, so that the last entry on each subject would be a NA. Thanks again for your help Roberto SUBJECT DATE RESULT DateDiff ResultDiff 10751 22-Jul-03 3.5 10751 13-Feb-04 1.3 10751 20-Aug-04 1.6 10751 08-Mar-05 1.7 10751 30-Aug-05 1.6 10751 21-Feb-06 1.3 10751 31-Aug-06 1.2 10751 27-Feb-07 1.5 10751 29-Aug-07 1 10752 29-Jul-03 5.9 10752 24-Feb-04 5 10752 25-Aug-04 3.6 10752 11-Mar-05 5.1 10752 18-Sep-05 2.2 10752 23-Feb-06 3.1 10752 24-Aug-06 3.7 10752 27-Feb-07 6 -Original Message- From: Roberto Lodeiro Muller roberto.mul...@doctor.com To: r-help@r-project.org Sent: Mon, Mar 21, 2011 3:23 pm Subject: [R] Computing row differences in new columns i I have the following columns with dates and results, sorted by subject and date. 'd like to compute the differences in dates and results for each patient, based n the previous row. Obviously the last entry for each subject should be a NA. Which would be the best way to accomplished that ? I guess questions like that have been already answered a thousand times, so I pologize for asking one more time. Thanks Roberto SUBJECT ate esult ateDiff esultDiff 10751 2-Jul-03 .5 0751 3-Feb-04 .3 10751 0-Aug-04 .6 10751 8-Mar-05 .7 10751 0-Aug-05 .6 10751 1-Feb-06 .3 10751 1-Aug-06 .2 10751 7-Feb-07 .5 10751 9-Aug-07 10752 9-Jul-03 .9 10752 4-Feb-04 10752 5-Aug-04 .6 10752 1-Mar-05 .1 10752 8-Sep-05 .2 10752 3-Feb-06 .1 10752 4-Aug-06 .7 10752 7-Feb-07 [[alternative HTML version deleted]] __ -h...@r-project.org mailing list ttps://stat.ethz.ch/mailman/listinfo/r-help LEASE do read the posting guide http://www.R-project.org/posting-guide.html nd 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. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O __ 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.
