On Fri, 24 Jun 2005, Spencer Graves wrote: (...) > The key is computing your own generalized inverse and using that with > "inverted=TRUE". (...)
One method to do this is function solvecov in package fpc. Christian > > spencer graves > > Karen Kotschy wrote: > > Dear R community > > > > Have just recently got back into R after a long break and have been amazed > > at > > how much it has grown, and how active the list is! Thank you so much to all > > those who contribute to this amazing project. > > > > My question: > > I am trying to calculate Mahalanobis distances for a matrix called > > "fgmatrix" > > > > > >>dim(fgmatrix) > > > > [1] 76 15 > > > > > >>fg.cov <- cov.wt(fgmatrix) > >>mahalanobis(fgmatrix, center = fg.cov$center, cov = fg.cov$cov) > > > > > > Then I get an error message "Covariance matrix is apparently singular" > > > > What does this mean? I can't see anything strange about the covariance > > matrix, > > and am not getting anywhere with the help files. > > > > > >>dim(fg.cov$cov) > > > > [1] 15 15 > > > >>length(fg.cov$center) > > > > [1] 15 > > > > > > Thanks > > -- > Spencer Graves, PhD > Senior Development Engineer > PDF Solutions, Inc. > 333 West San Carlos Street Suite 700 > San Jose, CA 95110, USA > > [EMAIL PROTECTED] > www.pdf.com <http://www.pdf.com> > Tel: 408-938-4420 > Fax: 408-280-7915 > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > *** NEW ADDRESS! *** Christian Hennig University College London, Department of Statistical Science Gower St., London WC1E 6BT, phone +44 207 679 1698 [EMAIL PROTECTED], www.homepages.ucl.ac.uk/~ucakche ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
