Lukas Stadler
2017-Mar-28 12:49 UTC
[Rd] `[` not recognized as a primitive in certain cases.
?typeof? is your friend here:> typeof(`[`)[1] "special"> typeof(mc[[1]])[1] "symbol"> typeof(mc2[[1]])[1] "special" so mc[[1]] is a symbol, and thus not a primitive. - Lukas> On 28 Mar 2017, at 14:46, Michael Lawrence <lawrence.michael at gene.com> wrote: > > There is a difference between the symbol and the function (primitive > or closure) to which it is bound. > > This: > mc2 <- as.call(list(`[`,iris,2,"Species")) > > Evaluates `[` to its value, in this case the primitive object, and the > primitive itself is incorporated into the returned call. > > If you were to do this: > mc2 <- as.call(list(quote(`[`),iris,2,"Species")) > > The `[` would _not_ be evaluated, quote() would return the symbol, and > the symbol would end up in the call. > > The two forms have virtually identical behavior as long as the call > ends up getting evaluated in the same environment. > > On Tue, Mar 28, 2017 at 3:03 AM, Joris Meys <jorismeys at gmail.com> wrote: >> Dear, >> >> I have noticed this problem while looking at the following question on >> Stackoverflow : >> >> http://stackoverflow.com/questions/42894213/s4-class-subset-inheritance-with-additional-arguments >> >> While going through callNextMethod, I've noticed the following odd >> behaviour: >> >> mc <- call("[",iris,2,"Species") >> >> mc[[1]] >> ## `[` >> >> is.primitive(`[`) >> ## [1] TRUE >> >> is.primitive(mc[[1]]) >> ## [1] FALSE >> # Expected to be TRUE >> >> mc2 <- as.call(list(`[`,iris,2,"Species")) >> >> is.primitive(mc2[[1]]) >> ## [1] TRUE >> >> So depending on how I construct the call (using call() or as.call() ), the >> function `[` is or is not recognized as a primitive by is.primitive() >> >> The behaviour is counterintuitive and -unless I miss something obvious >> here- likely to be a bug imho. I immediately admit that my C chops aren't >> sufficient to come up with a patch. >> >> Cheers >> Joris >> >> -- >> Joris Meys >> Statistical consultant >> >> Ghent University >> Faculty of Bioscience Engineering >> Department of Mathematical Modelling, Statistics and Bio-Informatics >> >> tel : +32 (0)9 264 61 79 >> Joris.Meys at Ugent.be >> ------------------------------- >> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-devel at r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel
Thank you gents, I overlooked the subtle differences. On Tue, Mar 28, 2017 at 2:49 PM, Lukas Stadler <lukas.stadler at oracle.com> wrote:> ?typeof? is your friend here: > > > typeof(`[`) > [1] "special" > > typeof(mc[[1]]) > [1] "symbol" > > typeof(mc2[[1]]) > [1] "special" > > so mc[[1]] is a symbol, and thus not a primitive. > > - Lukas > > > On 28 Mar 2017, at 14:46, Michael Lawrence <lawrence.michael at gene.com> > wrote: > > > > There is a difference between the symbol and the function (primitive > > or closure) to which it is bound. > > > > This: > > mc2 <- as.call(list(`[`,iris,2,"Species")) > > > > Evaluates `[` to its value, in this case the primitive object, and the > > primitive itself is incorporated into the returned call. > > > > If you were to do this: > > mc2 <- as.call(list(quote(`[`),iris,2,"Species")) > > > > The `[` would _not_ be evaluated, quote() would return the symbol, and > > the symbol would end up in the call. > > > > The two forms have virtually identical behavior as long as the call > > ends up getting evaluated in the same environment. > > > > On Tue, Mar 28, 2017 at 3:03 AM, Joris Meys <jorismeys at gmail.com> wrote: > >> Dear, > >> > >> I have noticed this problem while looking at the following question on > >> Stackoverflow : > >> > >> http://stackoverflow.com/questions/42894213/s4-class- > subset-inheritance-with-additional-arguments > >> > >> While going through callNextMethod, I've noticed the following odd > >> behaviour: > >> > >> mc <- call("[",iris,2,"Species") > >> > >> mc[[1]] > >> ## `[` > >> > >> is.primitive(`[`) > >> ## [1] TRUE > >> > >> is.primitive(mc[[1]]) > >> ## [1] FALSE > >> # Expected to be TRUE > >> > >> mc2 <- as.call(list(`[`,iris,2,"Species")) > >> > >> is.primitive(mc2[[1]]) > >> ## [1] TRUE > >> > >> So depending on how I construct the call (using call() or as.call() ), > the > >> function `[` is or is not recognized as a primitive by is.primitive() > >> > >> The behaviour is counterintuitive and -unless I miss something obvious > >> here- likely to be a bug imho. I immediately admit that my C chops > aren't > >> sufficient to come up with a patch. > >> > >> Cheers > >> Joris > >> > >> -- > >> Joris Meys > >> Statistical consultant > >> > >> Ghent University > >> Faculty of Bioscience Engineering > >> Department of Mathematical Modelling, Statistics and Bio-Informatics > >> > >> tel : +32 (0)9 264 61 79 > >> Joris.Meys at Ugent.be > >> ------------------------------- > >> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php > >> > >> [[alternative HTML version deleted]] > >> > >> ______________________________________________ > >> R-devel at r-project.org mailing list > >> https://stat.ethz.ch/mailman/listinfo/r-devel > > > > ______________________________________________ > > R-devel at r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel > >-- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Mathematical Modelling, Statistics and Bio-Informatics tel : +32 (0)9 264 61 79 Joris.Meys at Ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php [[alternative HTML version deleted]]
Martin Maechler
2017-Mar-29 07:26 UTC
[Rd] `[` not recognized as a primitive in certain cases.
>>>>> Joris Meys <jorismeys at gmail.com> >>>>> on Tue, 28 Mar 2017 15:19:14 +0200 writes:> Thank you gents, I overlooked the subtle differences. > On Tue, Mar 28, 2017 at 2:49 PM, Lukas Stadler <lukas.stadler at oracle.com> > wrote: >> ?typeof? is your friend here: >> >> > typeof(`[`) >> [1] "special" >> > typeof(mc[[1]]) >> [1] "symbol" >> > typeof(mc2[[1]]) >> [1] "special" >> >> so mc[[1]] is a symbol, and thus not a primitive. or str() which should be better known to Joe Average useR> mc <- call("[",iris,2,"Species") > str(mc[[1]])symbol [> str(`[`).Primitive("[")>>> - Lukas >> >> > On 28 Mar 2017, at 14:46, Michael Lawrence <lawrence.michael at gene.com> >> wrote: >> > >> > There is a difference between the symbol and the function (primitive >> > or closure) to which it is bound. >> > >> > This: >> > mc2 <- as.call(list(`[`,iris,2,"Species")) >> > >> > Evaluates `[` to its value, in this case the primitive object, and the >> > primitive itself is incorporated into the returned call. >> > >> > If you were to do this: >> > mc2 <- as.call(list(quote(`[`),iris,2,"Species")) >> > >> > The `[` would _not_ be evaluated, quote() would return the symbol, and >> > the symbol would end up in the call. >> > >> > The two forms have virtually identical behavior as long as the call >> > ends up getting evaluated in the same environment. >> > >> > On Tue, Mar 28, 2017 at 3:03 AM, Joris Meys <jorismeys at gmail.com> wrote: >> >> Dear, >> >> >> >> I have noticed this problem while looking at the following question on >> >> Stackoverflow : >> >> >> >> http://stackoverflow.com/questions/42894213/s4-class- >> subset-inheritance-with-additional-arguments >> >> >> >> While going through callNextMethod, I've noticed the following odd >> >> behaviour: >> >> >> >> mc <- call("[",iris,2,"Species") >> >> >> >> mc[[1]] >> >> ## `[` >> >> >> >> is.primitive(`[`) >> >> ## [1] TRUE >> >> >> >> is.primitive(mc[[1]]) >> >> ## [1] FALSE >> >> # Expected to be TRUE >> >> >> >> mc2 <- as.call(list(`[`,iris,2,"Species")) >> >> >> >> is.primitive(mc2[[1]]) >> >> ## [1] TRUE >> >> >> >> So depending on how I construct the call (using call() or as.call() ), >> the >> >> function `[` is or is not recognized as a primitive by is.primitive() >> >> >> >> The behaviour is counterintuitive and -unless I miss something obvious >> >> here- likely to be a bug imho. I immediately admit that my C chops >> aren't >> >> sufficient to come up with a patch. >> >> >> >> Cheers >> >> Joris >> >> >> >> -- >> >> Joris Meys >> >> Statistical consultant >> >> >> >> Ghent University >> >> Faculty of Bioscience Engineering >> >> Department of Mathematical Modelling, Statistics and Bio-Informatics >> >> >> >> tel : +32 (0)9 264 61 79 >> >> Joris.Meys at Ugent.be >> >> ------------------------------- >> >> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php >> >> >> >> [[alternative HTML version deleted]] >> >> >> >> ______________________________________________ >> >> R-devel at r-project.org mailing list >> >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > >> > ______________________________________________ >> > R-devel at r-project.org mailing list >> > https://stat.ethz.ch/mailman/listinfo/r-devel >> >> > -- > Joris Meys > Statistical consultant > Ghent University > Faculty of Bioscience Engineering > Department of Mathematical Modelling, Statistics and Bio-Informatics > tel : +32 (0)9 264 61 79 > Joris.Meys at Ugent.be > ------------------------------- > Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php > [[alternative HTML version deleted]] > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel
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