>>>>> Duncan Murdoch >>>>> on Tue, 29 Dec 2020 08:37:51 -0500 writes:
> On 29/12/2020 8:29 a.m., Rui Barradas wrote: >> Hello, >> >> R 4.0.3 on Ubuntu 20.10, session info at end. >> >> Isn't the default value of argument drop missing in >> >> ?`[.data.frame` >> >> Usage: >> >> ## S3 method for class 'data.frame' >> x[i, j, drop = ] >> >> >> I had the impression that it was TRUE (it is when running the function, >> I'm talking about the docs). > No, you can see it if you print `[.data.frame`: >> `[.data.frame` > function (x, i, j, drop = if (missing(i)) TRUE else length(cols) == > 1) > So if you ask for specific rows and your dataframe has more than one > column, it defaults to FALSE. > I think the Rd checks allow you to leave out defaults, but don't allow > you to state them incorrectly, so that's probably why it is left as > blank in the Usage section, and explained in the Arguments section. > Duncan Murdoch Yes, indeed, Duncan, it is as you think (above). It is "official" in the sense that we've used this for a long time in order to keep the 'Usage' section cleaner, when some defaults are sophisticated, and a help page reader should rather read the corresponding argument description. Martin >> sessionInfo() >> R version 4.0.3 (2020-10-10) >> Platform: x86_64-pc-linux-gnu (64-bit) >> Running under: Ubuntu 20.04.1 LTS >> >> Matrix products: default >> BLAS: /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.9.0 >> LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.9.0 >> >> locale: >> [1] LC_CTYPE=pt_PT.UTF-8 LC_NUMERIC=C >> [3] LC_TIME=pt_PT.UTF-8 LC_COLLATE=pt_PT.UTF-8 >> [5] LC_MONETARY=pt_PT.UTF-8 LC_MESSAGES=pt_PT.UTF-8 >> [7] LC_PAPER=pt_PT.UTF-8 LC_NAME=C >> [9] LC_ADDRESS=C LC_TELEPHONE=C >> [11] LC_MEASUREMENT=pt_PT.UTF-8 LC_IDENTIFICATION=C >> >> attached base packages: >> [1] stats graphics grDevices utils datasets methods base >> >> loaded via a namespace (and not attached): >> [1] compiler_4.0.3 tools_4.0.3 >> >> >> Happy holidays, >> >> Rui Barradas >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel