Thanks Sean.. On Tue, Apr 12, 2011 at 3:10 PM, Sean Davis <sdavis2@mail.nih.gov> wrote: > On Tue, Apr 12, 2011 at 8:54 AM, pankaj borah > <pankajborah2k3@yahoo.co.in> wrote: > > I have a list ( L) of 63 objects and each object has 30800 variables. > > > >>str (L) > > > > List of 63 > > $ objec1 : num [1:30300] 0.927 0.813 0.397 0.703 0.651 ... > > $ object2 : num [1:30300] 0.636 0.447 0.738 0.648 0.62 ... > > ............. > > $ object63 : num [1:30380] 0.1123 0.2119 0.4078 0.0383 0.0641 .... > > > > > > > > > > I want to convert the list L to a matrix M > > > > So it should be --- > >>str(M) > > > > num [1:30380, 1:63] > > attr(*, "dimnames")=List of 2 > > > > > > How do I do that ? > > Try: > > M = do.call('cbind',L) > > Sean > [[alternative HTML version deleted]]

Thanks Carlos, It worked. I had to transpose it. t(do.call( rbind, a )) Thanks a lot, Pankaj On Tue, Apr 12, 2011 at 3:09 PM, Carlos J. Gil Bellosta < cgb@datanalytics.com> wrote: > Hello, > > Try this: > > a <- list( a = 1:4, b = 2:5 ) > do.call( rbind, a ) > > Mind that not all your list entries seem to have 30800 variables. Some > seem to be shorter. > > Best regards, > > Carlos J. Gil Bellosta > http://www.datanalytics.com > > > 2011/4/12 pankaj borah <pankajborah2k3@yahoo.co.in>: > > I have a list ( L) of 63 objects and each object has 30800 variables. > > > >>str (L) > > > > List of 63 > > $ objec1 : num [1:30300] 0.927 0.813 0.397 0.703 0.651 ... > > $ object2 : num [1:30300] 0.636 0.447 0.738 0.648 0.62 ... > > ............. > > $ object63 : num [1:30380] 0.1123 0.2119 0.4078 0.0383 0.0641 .... > > > > > > > > > > I want to convert the list L to a matrix M > > > > So it should be --- > >>str(M) > > > > num [1:30380, 1:63] > > attr(*, "dimnames")=List of 2 > > > > > > How do I do that ? > > > > Regards, > > > > Pankaj Barah > > > > Department of Biology, > > Norwegian University of Science & Technology (NTNU) > > Realfagbygget, N-7491 Trondheim, Norway > > > > [[alternative HTML version deleted]] > > > > > > _______________________________________________ > > Bioconductor mailing list > > Bioconductor@r-project.org > > https://stat.ethz.ch/mailman/listinfo/bioconductor > > Search the archives: > http://news.gmane.org/gmane.science.biology.informatics.conductor > > > [[alternative HTML version deleted]]

More generally, here's a utility that will bind arrays after checking compatibility. It's passed some testing; may not be completely bullet-proof. Vectors are bound in columns, not rows. pancake = function(arrays) { ### Purpose: given a list of arrays, all of the same shape, construct an array of one greater dimension by piling the list elements together. Set the dimnames appropriately. if(wereVectors <- all(sapply(arrays, is.vector))) arrays <- lapply(arrays, matrix) if(length(common.dim <- unique(lapply(arrays, dim))) != 1L) stop("Elements should be arrays of the same shape.") if(length(unique(lapply(arrays, mode))) != 1L) stop("Elements should be arrays of the same mode.") theDim <- c(common.dim[[1]], length(arrays)) ### dim of new array. answer <- array(unlist(arrays), dim=theDim) ### Create dimnames for answer. eachNames <- dimnames(arrays[[1]]) ### Uses only the 1st array. Assumes all components have the same dimnames. ### <- TODO: maybe check assumption, warn or maybe throw error. if(is.null(eachNames)) eachNames <- lapply(dim(arrays[[1]]), seq) extraDimName <- names(arrays) if(is.null(extraDimName)) extraDimName <- seq(length(arrays)) answerNames <- c(eachNames, list(extraDimName)) dimnames(answer) <- answerNames if(wereVectors) answer <- answer[ , 1, , drop=T] return(answer) } Roger Day University of Pittsburgh Departments of Biomedical Informatics and Biostatistics University of Pittsburgh Cancer Institute University of Pittsburgh Molecular Medicine Institute ----------------------------------------------------- Room 310, Suite 301 Cancer Pavilion (CNPAV) 5150 Centre Ave. Pittsburgh, PA 15232 e-mail: day01 at pitt.edu cell phone 412-609-3918 assistant: Lucy Cafeo: (412) 623-2952 ----------------------------------------------------- On Apr 14, 2011, at 12:11 PM, Arunava Chakravartty wrote: > try >> do.call(rbind,L) > > On Tue, Apr 12, 2011 at 7:54 AM, pankaj borah <pankajborah2k3 at="" yahoo.co.in="">wrote: > >> I have a list ( L) of 63 objects and each object has 30800 variables. >> >>> str (L) >> >> List of 63 >> $ objec1 : num [1:30300] 0.927 0.813 0.397 0.703 0.651 ... >> $ object2 : num [1:30300] 0.636 0.447 0.738 0.648 0.62 ... >> ............. >> $ object63 : num [1:30380] 0.1123 0.2119 0.4078 0.0383 0.0641 .... >> >> >> >> >> I want to convert the list L to a matrix M >> >> So it should be --- >>> str(M) >> >> num [1:30380, 1:63] >> attr(*, "dimnames")=List of 2 >> >> >> How do I do that ? >> >> Regards, >> >> Pankaj Barah >> >> Department of Biology, >> Norwegian University of Science & Technology (NTNU) >> Realfagbygget, N-7491 Trondheim, Norway >> >> [[alternative HTML version deleted]] >> >> >> _______________________________________________ >> Bioconductor mailing list >> Bioconductor at r-project.org >> https://stat.ethz.ch/mailman/listinfo/bioconductor >> Search the archives: >> http://news.gmane.org/gmane.science.biology.informatics.conductor >> > > > > -- > Arunava Chakravartty > 1431 Johnson Drive, # 1011 > Buffalo Grove, IL 60089 > > [[alternative HTML version deleted]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at r-project.org > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor