The fact that it is consistent with the documentation is not the point. The point is that the design itself is inconsistent.
On Sun, Sep 8, 2024 at 8:27 AM Marc Schwartz <marc_schwa...@me.com> wrote: > > Hi Gabor, > > In strictly reading the help files for both nrow() and row(), the 'x' > argument in the former case is "a vector, array, data frame, or NULL.", > whereas in the latter case it is "a matrix-like object, that is one with a > two-dimensional dim.". > > Thus, I would expect row() to fail on a >= 3-dimensional array, as your > example shows. > > In reading the help file for slice.index(), there is the following in the See > Also section: > > "row and col for determining row and column indexes; in fact, these are > special cases of slice.index corresponding to MARGIN equal to 1 and 2, > respectively when x is a matrix." > > further differentiating the behavior of row() and col() as more specific > implementations in the 2-dimensional case. > > To my read then, the difference in behavior appears to be intentional and > expected. > > Regards, > > Marc Schwartz > > > -----Original Message----- > From: R-devel <r-devel-boun...@r-project.org > <mailto:r-devel-boun...@r-project.org>> on behalf of Gabor Grothendieck > <ggrothendi...@gmail.com <mailto:ggrothendi...@gmail.com>> > Date: Sunday, September 8, 2024 at 7:31 AM > To: "r-devel@r-project.org <mailto:r-devel@r-project.org>" > <r-devel@r-project.org <mailto:r-devel@r-project.org>> > Subject: [Rd] Inconsistency between row and nrow > > > In the following nrow provides the expected result but row gives an > error. I would have thought that they would both work or both fail. > > > aa <- array(dim = 5:3) > > > nrow(aa) > ## [1] 5 > > > row(aa) > ## Error in row(aa) : a matrix-like object is required as argument to 'row' > > > # this does work: > slice.index(aa, 1) > > > -- > Statistics & Software Consulting > GKX Group, GKX Associates Inc. > tel: 1-877-GKX-GROUP > email: ggrothendieck at gmail.com > > > ______________________________________________ > R-devel@r-project.org <mailto:R-devel@r-project.org> mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > <https://stat.ethz.ch/mailman/listinfo/r-devel> > > > > -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
