On Wed, 26 Dec 2007, SNN wrote: > > Hi, > > I do have a file that has 500000 columns and 40 rows. I want to apply PCA on > that data and this is what I did > > h1<-read.table("Ccode.txt", sep='\t', header=F) # reads the data from the > file Ccode.txt > h2<-prcomp(na.omit(h1),center=T) > > but I am getting the following error > > "Error in svd(x, nu = 0) : 0 extent dimensions" > > > I appreciate if someone can help
You probably have a missing value in every row. But does PCA with 500000 columns make sense: 4999961 of the PCs are constant and arbitrary? It is possible you meant PC on the transpose (sometimes called Q-mode) -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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.