Dear list, I am dealing with between group analysis (BGA) from the made4 package and I have a problem with some of the affy names: I tried bga.suppl(training.set[list,], supdata=test.set[list,], classvec=cl_train, supvec=cl_test) 'training.set' and 'test.set' are expression sets, and 'cl_train' and 'cl_test' the corresponding classification vectors. 'list' contains some selected affy IDs. >list [1] "217367_s_at" "202880_s_at" "1565905_at" "236347_at" ... I tried bga with different lists, and in most cases, this works fine. But however, sometimes the following error message appears: Error in "dimnames<-.data.frame"(`*tmp*`, value = list(c("217367_s_at", : invalid 'dimnames' given for data frame It has definitively to do with the selected identifiers, and I have the impression that made4 can not manage identifiers with an minus sign inside, such as: AFFX-HUMGAPDH/M33197_M_at AFFX-BioDn-3_at I am running ade4 (Version: 1.4-2) and made4 (Version: 1.8.0) under R 2.3.1 Has somebody an idea how to handle this problem? Thanks in advance, Heike -- Dr. Heike Pospisil | pospisil at zbh.uni-hamburg.de University of Hamburg | Center for Bioinformatics Bundesstrasse 43 | 20146 Hamburg, Germany phone:+49-40-42838-7303 | fax: +49-40-42838-7312

Dear Heike I have not encountered this problem with Affy data, but it sounds like a R error caused by moving between a matrix and data.frame. I convert affy data using data.frame(exprs(arraydata)), as ade4 expects data in data.frame. Can you email me a subset of the data which is giving you this problem. Or can you run a traceback() on this, so I can pin-point the problem. Thanks a million Aedin >I tried bga with different lists, and in most cases, this works fine. >But however, sometimes the following error message appears: >Error in "dimnames<-.data.frame"(`*tmp*`, value = list(c("217367_s_at", > > invalid 'dimnames' given for data frame > -- Aed?n Culhane, Research Associate in Prof. J Quackenbush Lab Harvard School of Public Health, Dana-Farber Cancer Institute 44 Binney Street, SM822 ****Please note change of address**** Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute Boston, MA 02115 USA Phone: +1 (617) 632 2468 Fax: +1 (617) 582 7760 Email: aedin at jimmy.harvard.edu Web URL: http://www.hsph.harvard.edu/researchers/aculhane.html

Dear Heike, This was a bug in made4. I have corrected this in the devel version of made4. I attach this bug-fix in the enclosed R code. Please source this file and bga should run without problems. As an aside, if read.table will automatically create a data.frame, so you don't need to do as.data.frame. data<-as.data.frame(read.table(file=paste(dir,"data2.txt",sep=""),head er=TRUE,row.names="ID")) > data1 <-read.table("data2.txt",header=TRUE,row.names="ID") > class(data1) [1] "data.frame" made4 will read in ExpressionSet, matrix, data.frame or most bioconductor data classes. So you don't need to convert to a data.frame before running bga. Although possible, its generally not advised to call an object the same name as a function. list<-rownames(data)[1:26] I am very sorry about the bug. Thanks a million for brining it to my attention. Kinds Regards Aedin Heike Pospisil wrote: > Dear Aedin, > > thank you for your fast reply. > >> I have not encountered this problem with Affy data, but it sounds like >> a R error caused by moving between a matrix and data.frame. > > > Yes, this could be. But I did not find the error :-( > >> I convert affy data using data.frame(exprs(arraydata)), as ade4 >> expects data in data.frame. > > > So did I. > >> Can you email me a subset of the data which is giving you this >> problem. Or can you run a traceback() on this, so I can pin-point the >> problem. > > > I prepared a fictitious expression set and attached it in two versions: > - example.Rdata is the ExpressionSet > - data2.txt contains the expressions as a matrix > > You can load either the Rdata or the txt file: > ############################################# > ##### Load Data ###### > ############################################# > dir<-your.download.directory > data<-as.data.frame(read.table(file=paste(dir,"data2.txt",sep=""),he ader=TRUE,row.names="ID")) > > ######## or ############### > load(paste(dir,"example.Rdata",sep="")) > data1<-exprs(data2) > data<-as.data.frame(data1) > > > ############################################# > ##### BGA ##### > ############################################# > cl_training<-c(0,0,1,1) > cl_testing<-c(0,0,1,1) > > list<-rownames(data)[1:26] > bga.suppl(data[list,1:4], supdata=data[list,5:8],classvec=cl_training, > supvec=cl_testing) > > It works very fine with the first 26 probe sets. But it crashes if I > select the first 27 probes: > > list<-rownames(data)[1:27] > bga.suppl(data[list,1:4], supdata=data[list,5:8],classvec=cl_training, > supvec=cl_testing) > > Error in "dimnames<-.data.frame"(`*tmp*`, value = list(c("65884_at", > "66053_at", : > invalid 'dimnames' given for data frame > > Hope, it is clear what I meant and I hope you can load my dummy data. > > Would be great if you could help me. > > Thanks a lot and best wishes, > Heike > > -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: bga.bugfix.R Url: https://stat.ethz.ch/pipermail/bioconductor/attachments/20061126/ 0d91392a/attachment.pl