Serguei Kaniovski <[EMAIL PROTECTED]> writes: > For example, > > year X1958 X1973 X1981 X1986 X1995 X2004 X2007 > 1 QMT 12 41 45 54 62 232 255 > 2 Belgium 2 5 5 5 5 12 12 > 3 France 4 10 10 10 10 29 29 > > year X1958 X1973 X1981 X1986 X1995 X2004 X2007 > 1 QMT 12 41 45 54 62 232 255 > 2 Belgium 9054483 9741700 9859000 9859000 10137000 10418000 10497000 > 3 France 45800391 53294898 55419102 56898199 59418699 62177398 63209000 > > mat1/mat2 produces > > year X1958 X1973 X1981 X1986 X1995 X2004 X2007 > 1 NA 1.00e+00 1.00e+00 1.00e+00 1.00e+00 1.00e+00 1.00e+00 1.00e+00 > 2 NA 2.21e-07 5.13e-07 5.07e-07 5.07e-07 4.93e-07 1.15e-06 1.14e-06 > 3 NA 8.73e-08 1.88e-07 1.80e-07 1.76e-07 1.68e-07 4.66e-07 4.59e-07 > > with NA in the first column. Serguei
So these are _not_ tables, but dataframes and you're trying to take the ratio of two character vectors. So don't do that. Instead, tbl1 <- as.table(mat1[-1]) rownames(tbl1) <- mat1[1,] etc. Or just put column 1 back in if you insist on sticking with data frames. Or cbind(mat[1,],mat1[-1]/mat2[-1]). -- O__ ---- Peter Dalgaard Ă˜ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.