It may throw light on the confusion to get right down to basics: str(c(1,2,3)) # num [1:3] 1 2 3 str(1:3) # int [1:3] 1 2 3
typeof(c(1,2,3)) # [1] "double" typeof(1:3) # [1] "integer" so, to start with, they are simply not variables of the same type (real versus integer). However, once you start to use them, one is likely to be coerced into the same type as the other if they occur together in an expression. Hence the "confusing" results from Bill Venables! Ted. On 02-Aug-10 04:09:35, bill.venab...@csiro.au wrote: > Just to add to the confusion, for (nearly) all practical purposes they > are the same: > >> all.equal(df1, df2) > [1] TRUE >> do.call(paste, df1) > [1] "1 4" "2 5" "3 6" >> do.call(paste, df2) > [1] "1 4" "2 5" "3 6" >> > > > > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Erik Iverson > Sent: Monday, 2 August 2010 1:48 PM > To: thmsfuller...@gmail.com > Cc: r-help@r-project.org > Subject: Re: [R] Why do the results of paste() depend on how the > argument (data.frame) is constructed? > > On 08/01/2010 08:48 PM, thmsfuller...@gmail.com wrote: >> Hi, >> >> The following two 'df's should be the same, although their >> constructions are different. > > But they aren't the same. > > df1 <- data.frame(X=c(1, 2, 3), Y=c(4, 5, 6)) > df2 <- data.frame(X=1:3, Y=4:6) > identical(df1, df2) > > yields FALSE > > See > > str(df1) > str(df2) > > to see how they differ. > > > > But the results of paste() are different. >> I don't see this is explained in ?paste. Could you help me understand >> why it is like this? >> >>> df=data.frame(X=c(1, 2, 3), Y=c(4, 5, 6)) >>> df >> X Y >> 1 1 4 >> 2 2 5 >> 3 3 6 >>> paste(df) >> [1] "c(1, 2, 3)" "c(4, 5, 6)" >>> df=data.frame(X=1:3, Y=4:6) >>> df >> X Y >> 1 1 4 >> 2 2 5 >> 3 3 6 >>> paste(df) >> [1] "1:3" "4:6" >>> >> >> > > ______________________________________________ > R-help@r-project.org 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. > > ______________________________________________ > R-help@r-project.org 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. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 02-Aug-10 Time: 10:14:59 ------------------------------ XFMail ------------------------------ ______________________________________________ R-help@r-project.org 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.
