[R] substring/strsplit question
Dear R People: Here is a toy example: x - c(2E,5W,12H) substr(x,2,2) [1] E W 2 Sometimes x has 3 elements, sometimes 2. I want to extract the last element, and then extract the other 1 or 2 elements. How can I do this, please? TIA, Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [EMAIL PROTECTED] __ 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] substring/strsplit question
## untested last - tail(x, n = 1) first - head(x, n = length(x) - 1) Erin Hodgess wrote: Dear R People: Here is a toy example: x - c(2E,5W,12H) substr(x,2,2) [1] E W 2 Sometimes x has 3 elements, sometimes 2. I want to extract the last element, and then extract the other 1 or 2 elements. How can I do this, please? TIA, Sincerely, Erin __ 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] substring/strsplit question
Try this: library(gsubfn) ## The last character strapply(x, (.)$, simplify = TRUE) ## The last two character strapply(x, (..)$, simplify = TRUE) On Wed, Oct 29, 2008 at 6:57 PM, Erin Hodgess [EMAIL PROTECTED]wrote: Dear R People: Here is a toy example: x - c(2E,5W,12H) substr(x,2,2) [1] E W 2 Sometimes x has 3 elements, sometimes 2. I want to extract the last element, and then extract the other 1 or 2 elements. How can I do this, please? TIA, Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [EMAIL PROTECTED] __ 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 [[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] substring/strsplit question
How about x - c(2E,5W,12H) substr(x, nchar(x), nchar(x)) [1] E W H substr(x, 1, nchar(x)-1) [1] 2 5 12 -- David -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Erin Hodgess Sent: Wednesday, October 29, 2008 3:58 PM To: [EMAIL PROTECTED] Subject: [R] substring/strsplit question Dear R People: Here is a toy example: x - c(2E,5W,12H) substr(x,2,2) [1] E W 2 Sometimes x has 3 elements, sometimes 2. I want to extract the last element, and then extract the other 1 or 2 elements. How can I do this, please? TIA, Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [EMAIL PROTECTED] __ 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] substring/strsplit question
on 10/29/2008 03:57 PM Erin Hodgess wrote: Dear R People: Here is a toy example: x - c(2E,5W,12H) substr(x,2,2) [1] E W 2 Sometimes x has 3 elements, sometimes 2. I want to extract the last element, and then extract the other 1 or 2 elements. How can I do this, please? TIA, Sincerely, Erin Hi Erin, Is this what you want? # Get the last character gsub(.*(.)$, \\1, x) [1] E W H # Get the others gsub((^.*).$, \\1, x) [1] 2 5 12 See ?gsub HTH, Marc Schwartz __ 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] substring/strsplit question
Assuming that by elements you mean characters (2E is the first element of x but E is the last character in x[1]) then this will create a character matrix of dimensions: length(x) by 2 such that each row corresponds to one component of x and the second column in that row holds its last character while the first column in that row holds a string of the prior characters. x - c(2E,5W,12H) library(gsubfn) strapply(x, (.+)(.)$, c, simplify = rbind) [,1] [,2] [1,] 2 E [2,] 5 W [3,] 12 H The above assumes the latest version of gsubfn on CRAN. On Wed, Oct 29, 2008 at 4:57 PM, Erin Hodgess [EMAIL PROTECTED] wrote: Dear R People: Here is a toy example: x - c(2E,5W,12H) substr(x,2,2) [1] E W 2 Sometimes x has 3 elements, sometimes 2. I want to extract the last element, and then extract the other 1 or 2 elements. How can I do this, please? TIA, Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: [EMAIL PROTECTED] __ 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.
