I think the question was about table vs unique. Table groups by character representation, unique groups by the underlying representation.
On December 10, 2019 7:03:34 AM PST, Duncan Murdoch <murdoch.dun...@gmail.com> wrote: >On 10/12/2019 3:53 a.m., Alain Guillet wrote: >> Hi, >> >> I have a vector (see below the dput) and I use unique on it to get >unique values. If I then sort the result of the vector obtained by >unique, I see some elements that look like identical. I suspect it >could be a matter of rounded values but table gives a different result: >unlike unique output which contains "3.4 3.4", table has only one cell >for 3.4. >> >> Can anybody know why I get results that look like incoherent between >the two functions? > >dput() does some rounding, so it doesn't necessarily reproduce values >exactly. For example, > >x <- c(3.4, 3.4 + 1e-15) >unique(x) >#> [1] 3.4 3.4 >dput(x) >#> c(3.4, 3.4) >identical(x, c(3.4, 3.4)) >#> [1] FALSE > >If you really want to see exact values, you can use the "hexNumeric" >option to dput(): > >dput(x, control = "hexNumeric") >#> c(0x1.b333333333333p+1, 0x1.b333333333335p+1) >identical(x, c(0x1.b333333333333p+1, 0x1.b333333333335p+1)) >#> [1] TRUE > >Duncan Murdoch > >______________________________________________ >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. -- Sent from my phone. Please excuse my brevity. ______________________________________________ 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.
