rowMeans is designed for speed. It also has as.matrix inside it. On Tue, Mar 20, 2018 at 10:40 PM, Boris Steipe <boris.ste...@utoronto.ca> wrote: > 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.
______________________________________________ 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.