On Tue, 9 Mar 2004, Monica Palaseanu-Lovejoy wrote: > Hi, > > I am trying to calculate mahalanobis distances for a matrix x with > n*p variables. I am getting the following error: > > md2 <- mahalanobis(x, center, cov) > Error in solve.default(cov, tol = tol.inv) : > system is computationally singular: reciprocal condition > number = 2.11165e-009 > > What does it means?
Error messages usually mean what they say, and it hard to see what you mind to understand here. Whatever you supplied for `cov' is a singular matrix to the default tolerance, described on the help page. If you know what is going on with your data, you could reduce the argument `tol.inv'. -- 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
