Hi I have a matrix "u", for which diag() gives an error:
u <- structure(c(5.42334674128216, -2.31319389204264, -5.83059042218476, -1.64112369640695, -2.31319389212801, 3.22737617646609, 1.85200668021569, -0.57102273078531, -5.83059042231881, 1.85200668008156, 11.9488923894962, -3.5525537165941, -1.64112369587405, -0.571022730886046, -3.55255371755604, 10.0989829379577), .Dim = c(4, 4), .Dimnames = list(c("constant", NA, NA, NA), c("constant", NA, NA, NA))) > u constant <NA> <NA> <NA> constant 5.423347 -2.3131939 -5.830590 -1.6411237 <NA> -2.313194 3.2273762 1.852007 -0.5710227 <NA> -5.830590 1.8520067 11.948892 -3.5525537 <NA> -1.641124 -0.5710227 -3.552554 10.0989829 > is.matrix(u) [1] TRUE > diag(u) Error in if (is.list(nms) && !any(sapply(nms, is.null)) && all((nm <- nms[[1]][1:m]) == : missing value where TRUE/FALSE needed > What's going on here? > R.version _ platform powerpc-apple-darwin8.2.0 arch powerpc os darwin8.2.0 system powerpc, darwin8.2.0 status major 2 minor 2.0 year 2005 month 10 day 06 svn rev 35749 language R > -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html