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...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...