Olu, I think you may have misread what na.rm is supposed to do. I think you are getting the correct value. If you want the vectors that contain NA values to be evaluated to NA then you will need to set na.rm to FALSE (which is the default for prod()).
prod(c(7, 2, NA), na.rm = TRUE) [1] 14 prod(c(7, 2, NA), na.rm = FALSE) [1] NA Mark R. Mark Sharp, Ph.D. Director of Data Science Core Southwest National Primate Research Center Texas Biomedical Research Institute P.O. Box 760549 San Antonio, TX 78245-0549 Telephone: (210)258-9476 e-mail: msh...@txbiomed.org > On Nov 11, 2016, at 2:45 PM, Olu Ola via R-help <r-help@r-project.org> wrote: > > Hello,I have a dataset that is similar to the one as follows: > >> Df.1 <- data.frame(A = c(5,4,7,6,8,4),B = >> (c(1,5,2,4,9,1)),C=(c(2,3,NA,5,NA,9))) >> Df.1 > A B C > 1 5 1 2 > 2 4 5 3 > 3 7 2 NA > 4 6 4 5 > 5 8 9 NA > 6 4 1 9 >> Df.1$D = apply(Df.1, 1, prod, na.rm=T) >> Df.1$D[1] 10 60 14 120 72 36 >> Df.1 > A B C D > 1 5 1 2 10 > 2 4 5 3 60 > 3 7 2 NA 14 > 4 6 4 5 120 > 5 8 9 NA 72 > 6 4 1 9 36I intend to obtain a column D that takes into account na.rm=T but > 'apply' does not work in R 3.2.2 > > A way forward will be greatly appreciated. > > [[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. CONFIDENTIALITY NOTICE: This e-mail and any files and/or...{{dropped:10}} ______________________________________________ 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.
