>>>>> "RT" == Rolf Turner <r.tur...@auckland.ac.nz> >>>>> on Tue, 19 May 2009 11:02:08 +1200 writes:
RT> On 19/05/2009, at 10:20 AM, Steve Lianoglou wrote: >> Hi all, >> >> I've (tried) to look through the bug tracker, and gmane-search the >> R list to >> see if this has been mentioned before, and it looks like it hasn't. Yes, thank you. That's a bug on which we (R-core) currently work. More about this, and notably about Rolf's (.)*&^%)(&#%$) proposal on the R-devel list. Martin Maechler >> According to the R 2.9.0 release notes[1], the expand.grid function >> should now >> take a stringsAsFactor=LOGICAL argument which controls whether or >> not the >> function coerces strings as factors. While the parameter is indeed >> in the >> function, a quick examination of the function's source shows that >> the value >> of this argument is never checked, and all strings are converted to >> factors >> as a matter of course. >> >> The fix is pretty easy, and I believe only requires changing the >> `if` check >> here: >> >> if (!is.factor(x) && is.character(x)) >> x <- factor(x, levels = unique(x)) >> >> To: >> >> if (!is.factor(x) && is.character(x) && stringsAsFactors) >> x <- factor(x, levels = unique(x)) >> >> I can open a ticket regarding this issue and add this there if >> necessary. >> >> Thanks, >> -steve >> >> [1] http://article.gmane.org/gmane.comp.lang.r.general/146891 RT> While we're at it --- would it not make sense to have the RT> stringsAsFactors RT> argument (once it's working) of expand.grid() default to options() RT> $stringsAsFactors, RT> rather than to FALSE? RT> This would make no difference to me personally, since I set RT> options(stringsAsFactors=FALSE) in my .Rprofile. But it might make some RT> people happier .... RT> cheers, RT> Rolf Turner RT> ###################################################################### RT> Attention:\ This e-mail message is privileged and confid...{{dropped:9}} RT> ______________________________________________ RT> R-help@r-project.org mailing list RT> https://stat.ethz.ch/mailman/listinfo/r-help RT> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html RT> 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.