Re: [R] Converting 1-D array to vector
You were very close to an answer : as.vector(unlist(df[1,])) Nael On Wed, Aug 27, 2008 at 7:53 AM, Ronnen Levinson [EMAIL PROTECTED] wrote: Hi. How do I convert a one-dimensional array of characters to a character vector? In the example below I am trying to get the result c(a,d). The function as.vector() returns the same one-dimensional array, and unlist() returns something more complicated than I seek. Yours truly, Ronnen. P.S. E-mailed CCs of posted replies appreciated. df=data.frame(x=letters[1:3],y=letters[4:6]) df x y 1 a d 2 b e 3 c f df[1,] x y 1 a d as.vector(df[1,]) x y 1 a d unlist(df[1,]) x y a d Levels: a b c d e f c(a,d) # desired result [1] a d version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 7.0 year 2008 month 04 day22 svn rev45424 language R version.string R version 2.7.0 (2008-04-22) -- Ronnen Levinson, Ph.D. scientist, Lawrence Berkeley National Lab The Onion horoscope: Libra September 23 - October 23 Your tactics of overwhelming your opposition with spectacular shows of force and choking the roads with fleeing refugees will be seen as inappropriate by the other electronics wholesalers. __ 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] Converting 1-D array to vector
N. Lapidus wrote: You were very close to an answer : as.vector(unlist(df[1,])) I'd use as.character() there, for clarity. It's not easy to remember what as.vector on a factor variable does. Also notice that the original post has serious confusion about what the data structures are: df is data frame, not a matrix df[1,] is a one-row data frame, not a 1-d vector the components of df are factors, not character vectors A data frame is a kind of list, and lists are a kind of vector, hence as.vector does nothing to df[,1]. The unlist() function applied to factors will take the union of their level sets and concatenate the values. An alternative way is to make sure that you have a character matrix to begin with: as.matrix(df) x y [1,] a d [2,] b e [3,] c f as.matrix(df)[1,] x y a d (but beware the rather surprising as.character(df) [1] 1:3 1:3 !!!) Nael On Wed, Aug 27, 2008 at 7:53 AM, Ronnen Levinson [EMAIL PROTECTED] wrote: Hi. How do I convert a one-dimensional array of characters to a character vector? In the example below I am trying to get the result c(a,d). The function as.vector() returns the same one-dimensional array, and unlist() returns something more complicated than I seek. Yours truly, Ronnen. P.S. E-mailed CCs of posted replies appreciated. df=data.frame(x=letters[1:3],y=letters[4:6]) df x y 1 a d 2 b e 3 c f df[1,] x y 1 a d as.vector(df[1,]) x y 1 a d unlist(df[1,]) x y a d Levels: a b c d e f c(a,d) # desired result [1] a d -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ 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] Converting 1-D array to vector
c(as.matrix(df[1,])) will also work in your case. Gasper Cankar -Original Message- From: N. Lapidus [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 27, 2008 9:06 AM To: r-help@r-project.org Subject: Re: [R] Converting 1-D array to vector You were very close to an answer : as.vector(unlist(df[1,])) Nael On Wed, Aug 27, 2008 at 7:53 AM, Ronnen Levinson [EMAIL PROTECTED] wrote: Hi. How do I convert a one-dimensional array of characters to a character vector? In the example below I am trying to get the result c(a,d). The function as.vector() returns the same one-dimensional array, and unlist() returns something more complicated than I seek. Yours truly, Ronnen. P.S. E-mailed CCs of posted replies appreciated. df=data.frame(x=letters[1:3],y=letters[4:6]) df x y 1 a d 2 b e 3 c f df[1,] x y 1 a d as.vector(df[1,]) x y 1 a d unlist(df[1,]) x y a d Levels: a b c d e f c(a,d) # desired result [1] a d version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 7.0 year 2008 month 04 day22 svn rev45424 language R version.string R version 2.7.0 (2008-04-22) -- Ronnen Levinson, Ph.D. scientist, Lawrence Berkeley National Lab The Onion horoscope: Libra September 23 - October 23 Your tactics of overwhelming your opposition with spectacular shows of force and choking the roads with fleeing refugees will be seen as inappropriate by the other electronics wholesalers. __ 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. __ 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] Converting 1-D array to vector
Hi. How do I convert a one-dimensional array of characters to a character vector? In the example below I am trying to get the result c(a,d). The function as.vector() returns the same one-dimensional array, and unlist() returns something more complicated than I seek. Yours truly, Ronnen. P.S. E-mailed CCs of posted replies appreciated. df=data.frame(x=letters[1:3],y=letters[4:6]) df x y 1 a d 2 b e 3 c f df[1,] x y 1 a d as.vector(df[1,]) x y 1 a d unlist(df[1,]) x y a d Levels: a b c d e f c(a,d) # desired result [1] a d version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status major 2 minor 7.0 year 2008 month 04 day22 svn rev45424 language R version.string R version 2.7.0 (2008-04-22) -- Ronnen Levinson, Ph.D. scientist, Lawrence Berkeley National Lab The Onion horoscope: Libra September 23 - October 23 Your tactics of overwhelming your opposition with spectacular shows of force and choking the roads with fleeing refugees will be seen as inappropriate by the other electronics wholesalers. __ 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.
