Hello, See the difference.
a <- b <- c("A", "A", "B", "B", "C", "A", "C", "D", "A", "D", "C", "A", "D", "C", "A", "C")
a[3] <- NA table(a) table(a, exclude=NULL) # always include NA table(b, exclude=NULL) # always include NA # more flexible table(b, useNA="always") table(b, useNA="ifany") Hope this helps, Rui Barradas Em 02-07-2012 07:27, Sarah Auburn escreveu:
Dear Petr, Thanks for your help. Sorry one more query for one of my datasets which has NAs (missing genotypes). Is there any way in which I can count NAs? Many thanks! Sarah From: Sarah Auburn <saub...@yahoo.com> To: Petr Savicky <savi...@cs.cas.cz> Cc: "r-help@r-project.org" <r-help@r-project.org> Sent: Thursday, 7 June 2012, 23:24 Subject: Re: [R] table function in a matrix Perfect, thank you! From: Petr Savicky <savi...@cs.cas.cz> To: r-help@r-project.org Sent: Thursday, 7 June 2012, 19:42 Subject: Re: [R] table function in a matrix On Wed, Jun 06, 2012 at 11:02:46PM -0700, Sarah Auburn wrote:Hi, I am trying to get a summary of the counts of different variables for each sample in a matrix of the form "m" below to generate an output as shown. (Ultimately I want to generate a stacked barchart for each sample). I am only able to get the "table" function to work on one sample (column) at a time. Any help appreciated. Thank you Sarah ? a<-c("A", "A", "B", "B", "C", "A", "C", "D", "A", "D", "C", "A", "D", "C", "A", "C") m<-matrix(a, nrow=4) m ???? [,1] [,2] [,3] [,4] [1,] "A"? "C"? "A"? "D" [2,] "A"? "A"? "D"? "C" [3,] "B"? "C"? "C"? "A" [4,] "B"? "D"? "A"? "C" output needed (so that I can use the "barplot(t(output))" function): A B C D [,1] 2 2 0 0 [,2] 1 0 2 1 [,3] 2 0 1 1 [,4] 1 0 2 1Hi. Try the following. a<-c("A", "A", "B", "B", "C", "A", "C", "D", "A", "D", "C", "A", "D", "C", "A", "C") m<-matrix(a, nrow=4) tab <- function(x) { table(factor(x, levels=LETTERS[1:4])) } t(apply(m, 2, tab)) A B C D [1,] 2 2 0 0 [2,] 1 0 2 1 [3,] 2 0 1 1 [4,] 1 0 2 1 Factors are used to ensure that all the tables have the same length, even if some letters are missing. Hope this helps. Petr Savicky. ______________________________________________ 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.
