[R] Remove specific rows in a matrix/data.frame
Hi, imagine the following matrix/data.frame Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0 If the numbers for two identical letters are also identical then I want to remove either the first or the second row of that letter. If for a letter the numbers are 1 and 0 I want to remove the row with the 0. That means if the code works I would and up with the following matrix/data.frame Letter Number a 1 b 1 c 1 d 1 Many thanks, Syrvn -- View this message in context: http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902149.html Sent from the R help mailing list archive at Nabble.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] Remove specific rows in a matrix/data.frame
On Oct 13, 2011, at 12:42 PM, syrvn wrote: Hi, imagine the following matrix/data.frame Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0 If the numbers for two identical letters are also identical then I want to remove either the first or the second row of that letter. If for a letter the numbers are 1 and 0 I want to remove the row with the 0. ?duplicated That means if the code works I would and up with the following matrix/data.frame Letter Number a 1 b 1 c 1 d 1 But with no 1's associated with 'd' this does not make sense. Many thanks, Syrvn David Winsemius, MD 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] Remove specific rows in a matrix/data.frame
Hi Syrvn, how about this dtf-read.table(textConnection(Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0),header=T) aggregate(Number~Letter,data=dtf,max) cheers. Am 13.10.2011 18:42, schrieb syrvn: Hi, imagine the following matrix/data.frame Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0 If the numbers for two identical letters are also identical then I want to remove either the first or the second row of that letter. If for a letter the numbers are 1 and 0 I want to remove the row with the 0. That means if the code works I would and up with the following matrix/data.frame Letter Number a 1 b 1 c 1 d 1 Many thanks, Syrvn -- View this message in context: http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902149.html Sent from the R help mailing list archive at Nabble.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. -- Eik Vettorazzi Department of Medical Biometry and Epidemiology University Medical Center Hamburg-Eppendorf Martinistr. 52 20246 Hamburg T ++49/40/7410-58243 F ++49/40/7410-57790 -- Pflichtangaben gemäß Gesetz über elektronische Handelsregister und Genossenschaftsregister sowie das Unternehmensregister (EHUG): Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen Rechts; Gerichtsstand: Hamburg Vorstandsmitglieder: Prof. Dr. Guido Sauter (Vertreter des Vorsitzenden), Dr. Alexander Kirstein, Joachim Prölß, Prof. Dr. Dr. Uwe Koch-Gromus __ 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] Remove specific rows in a matrix/data.frame
try this:
x - read.table(textConnection(Letter Number
+ a 1
+ a 1
+ b 1
+ b 0
+ c 0
+ c 1
+ d 0
+ d 0), as.is = TRUE, header = TRUE)
closeAllConnections()
# following assumes that there are pairs of numbers
result - do.call(rbind, lapply(split(x, x$Letter), function(.pair){
+ if (all(.pair$Number[1L] == .pair$Number)) return(.pair[1L, ])
+ is1 - which(.pair$Number == 1)
+ if (length(is1) == 1) return(.pair[is1, ])
+ else return(NULL)
+ }))
result
Letter Number
a a 1
b b 1
c c 1
d d 0
On Thu, Oct 13, 2011 at 12:42 PM, syrvn ment...@gmx.net wrote:
Hi,
imagine the following matrix/data.frame
Letter Number
a 1
a 1
b 1
b 0
c 0
c 1
d 0
d 0
If the numbers for two identical letters are also identical then I want to
remove either the first or the
second row of that letter. If for a letter the numbers are 1 and 0 I want to
remove the row with the 0.
That means if the code works I would and up with the following
matrix/data.frame
Letter Number
a 1
b 1
c 1
d 1
Many thanks,
Syrvn
--
View this message in context:
http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902149.html
Sent from the R help mailing list archive at Nabble.com.
__
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and provide commented, minimal, self-contained, reproducible code.
--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
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Re: [R] Remove specific rows in a matrix/data.frame
Why would you end up with d1 in your output if you don't have a d1 in your original data frame? Are you saying that, when both letters have a zero after them, you want to replace one of them with a 1? -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of syrvn Sent: Thursday, October 13, 2011 9:43 AM To: r-help@r-project.org Subject: [R] Remove specific rows in a matrix/data.frame Hi, imagine the following matrix/data.frame Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0 If the numbers for two identical letters are also identical then I want to remove either the first or the second row of that letter. If for a letter the numbers are 1 and 0 I want to remove the row with the 0. That means if the code works I would and up with the following matrix/data.frame Letter Number a 1 b 1 c 1 d 1 Many thanks, Syrvn -- View this message in context: http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902149.html Sent from the R help mailing list archive at Nabble.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. __ 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] Remove specific rows in a matrix/data.frame
syrvn wrote on 10/13/2011 11:42:44 AM: Hi, imagine the following matrix/data.frame Letter Number a 1 a 1 b 1 b 0 c 0 c 1 d 0 d 0 If the numbers for two identical letters are also identical then I want to remove either the first or the second row of that letter. If for a letter the numbers are 1 and 0 I want to remove the row with the 0. That means if the code works I would and up with the following matrix/data.frame Letter Number a 1 b 1 c 1 d 1 Many thanks, Syrvn I assume that you made a typo when showing the results you want. Following your explanation, this is what I get: df - data.frame(Letter=letters[rep(1:4, rep(2, 4))], Number=c(1, 1, 1, 0, 0, 1, 0, 0)) # first, get rid of duplicates df2 - df[!duplicated(df), ] # then, get rid of 0s from letters that have both 0 and 1 both01 - tapply(df2$Number, df2$Letter, function(x) any(as.integer(x)==0) any(as.integer(x)==1)) delete - df2$Letter %in% names(both01)[both01] as.integer(df2$Number)==0 df3 - df2[!delete, ] # result df3 Letter Number 1 a 1 3 b 1 6 c 1 7 d 0 Jean [[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] Remove specific rows in a matrix/data.frame
Thanks for your answers! Will check them now :) Yes, sorry, I was wrong. Letter Number d 0 d 0 should be: Letter Number d 0 after applying the algorithm! -- View this message in context: http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902216.html Sent from the R help mailing list archive at Nabble.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] Remove specific rows in a matrix/data.frame
Hello again, dtf-read.table(textConnection(Letter Test Number a b 1 a b 1 b b 1 b b 0 c b 0 c b 1 d b 0 d b 0),header=T) aggregate(Number ~ Letter,data=dtf,max) how can I adjust this solution that the results also includes Test? I tried: aggregate(Number ~ Letter,data=dtf,max,by=list(Letter, Test, Number)) But it breaks with the following error message: Error in aggregate.data.frame(mf[1L], mf[-1L], FUN = FUN, ...) : arguments must have same length -- View this message in context: http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902286.html Sent from the R help mailing list archive at Nabble.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] Remove specific rows in a matrix/data.frame
Hi, just put it in the formula: aggregate(Number ~ Letter+Test,data=dtf,max) cheers Am 13.10.2011 19:30, schrieb syrvn: Hello again, dtf-read.table(textConnection(Letter Test Number a b 1 a b 1 b b 1 b b 0 c b 0 c b 1 d b 0 d b 0),header=T) aggregate(Number ~ Letter,data=dtf,max) how can I adjust this solution that the results also includes Test? I tried: aggregate(Number ~ Letter,data=dtf,max,by=list(Letter, Test, Number)) But it breaks with the following error message: Error in aggregate.data.frame(mf[1L], mf[-1L], FUN = FUN, ...) : arguments must have same length -- View this message in context: http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902286.html Sent from the R help mailing list archive at Nabble.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. -- Eik Vettorazzi Institut für Medizinische Biometrie und Epidemiologie Universitätsklinikum Hamburg-Eppendorf Martinistr. 52 20246 Hamburg T ++49/40/7410-58243 F ++49/40/7410-57790 __ 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.
