Here's a more "minimalist" and perhaps faster approach (asit uses indexing)
Let "gl" be the the vector with the gene list. omit <- gl == "batch" yourlist <- split( gl[omit], ,cumsum(omit)[!omit]) Cheers, Bert On Thu, Mar 29, 2012 at 9:25 AM, Martin Morgan <mtmor...@fhcrc.org> wrote: > On 03/29/2012 08:18 AM, konika chawla wrote: >> >> Hi >> Is there a function like splitstr, for splitting lists? >> I want to divide a list of gene names based on a recurring value like >> "batch" >> the list is like >> >> [1,] "AT4G25480" >> [2,] "AT3G20810" >> [3,] "AT2G46670" >> [4,] "AT4G27310" >> [5,] "batch" >> [6,] "AT1G04570" >> [7,] "AT5G62360" >> [8,] "AT2G31380" >> [9,] "AT3G54500" >> [10,] "AT2G36220" >> [11,] "batch" >> [12,] "AT5G06980" >> [13,] "AT2G46790" >> [14,] "AT3G55580" >> [15,] "AT1G73480" >> [16,] "AT5G54470" >> [17,] "AT1G07180" >> I want to split it in three gene lists, and remove the "batch" > > > Hi -- > > along the lines of > > split(v, cumsum(v == "batch")) > > where the first element of all groups except the first will be "batch", and > would need to be filtered. > > Map(function(elt) if (elt[1] == "batch") elt[-1] else elt, > split(v, cumsum(v == "batch"))) > > Martin > >> Any ideas? >> Thanks >> Konika >> >> ______________________________________________ >> 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. > > > > -- > Computational Biology > Fred Hutchinson Cancer Research Center > 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 > > Location: M1-B861 > Telephone: 206 667-2793 > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.