Either I am doing something very stupid or my R installation has a glitch. What am I missing? dd1? <- 50 dd2? <- 54 mean(dd1, dd2) [1] 50? # wrong (dd1 + dd2)/2 [1] 52 # correct aa? <- c(48, 52, 56, 54, 52) mean(aa) [1] 52.4 # correct [[alternative HTML version deleted]]
Hello, The first argument of mean is a vector, the dots argument is to be "passed to or from other methods." (from ?mean) Try instead mean(c(dd1, dd2)) Hope this helps, Rui Barradas ?s 17:39 de 21-07-2018, John Kane via R-help escreveu:> Either I am doing something very stupid or my R installation has a glitch. What am I missing? > dd1? <- 50 > dd2? <- 54 > > mean(dd1, dd2) > [1] 50? # wrong > > (dd1 + dd2)/2 > [1] 52 # correct > > aa? <- c(48, 52, 56, 54, 52) > > mean(aa) > [1] 52.4 # correct > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >
On 21/07/2018 12:39 PM, John Kane via R-help wrote:> Either I am doing something very stupid or my R installation has a glitch. What am I missing? > dd1? <- 50 > dd2? <- 54 > > mean(dd1, dd2) > [1] 50? # wrongRead the help page ?mean. You are specifying the parameters x and trim. Duncan Murdoch> > (dd1 + dd2)/2 > [1] 52 # correct > > aa? <- c(48, 52, 56, 54, 52) > > mean(aa) > [1] 52.4 # correct > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at 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. >
Read ?mean. Look at the argument list. The mean function only applies to the first argument. On July 21, 2018 9:39:42 AM PDT, John Kane via R-help <r-help at r-project.org> wrote:>Either I am doing something very stupid or my R installation has a >glitch. What am I missing? >dd1? <- 50 >dd2? <- 54 > >mean(dd1, dd2) >[1] 50? # wrong > >(dd1 + dd2)/2 >[1] 52 # correct > >aa? <- c(48, 52, 56, 54, 52) > >mean(aa) >[1] 52.4 # correct > > > > [[alternative HTML version deleted]] > >______________________________________________ >R-help at 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.-- Sent from my phone. Please excuse my brevity.