R > rowMeans(roop) [1] 1.666667 5.333333 3.000000 R > mean(as.numeric(roop[1,])) [1] 1.666667
:-) > On Mar 20, 2018, at 10:18 PM, Sorkin, John <jsor...@som.umaryland.edu> wrote: > > I am trying to get the mean of a row of a data frame. My code follows: > > > roop <- data.frame(x=c(1,2,3),y=c(4,5,2),z=c(0,9,4)) > roop > mean(roop[1,]) > mean(roop[1,c("x","y","z")]) > > > I get the following output: > >> roop > x y z > 1 1 4 0 > 2 2 5 9 > 3 3 2 4 >> mean(roop[1,]) > [1] NA > Warning message: > In mean.default(roop[1, ]) : > argument is not numeric or logical: returning NA >> mean(roop[1,c("x","y","z")]) > [1] NA > Warning message: > In mean.default(roop[1, c("x", "y", "z")]) : > argument is not numeric or logical: returning NA > > > It is clear the the mean function does not like the data I am passing to it. > I do not know why. How might I correct my code? > > > As always, > > Thank you, > > John > > > Thank you, > > John > > > > > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and > Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119 > (Fax) 410-605-7913 (Please call phone number above prior to faxing) > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.