subset(), like many R methods, has an argument list that ends with '...', meaning that it will not tell you that an argument you gave it by name= is not in the official list of arument names. If the ... were not there then you would have gotten an error message. E.g., the following makes a version of subset.data.frame without the ... argument:
> sb<-subset.data.frame > formals(sb) <- formals(sb)[1:4] > data(cars) > sb(cars, speed==19) speed dist 36 19 36 37 19 46 38 19 68 > sb(cars, speed=19) Error in sb(cars, speed = 19) : unused argument(s) (speed = 19) subset(cars, speed=19) silently ignores the argument you named "speed" and returns the entire cars dataset. I think that it is unfortunate that the method system requires these ... arguments, as it leads users to waste time tracking down typing errors that would otherwise be flagged. Bill Dunlap TIBCO Software Inc - Spotfire Division wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Mark Knecht > Sent: Tuesday, July 07, 2009 12:39 PM > To: Henrique Dallazuanna > Cc: r-help > Subject: Re: [R] Test for X=1 fails, test for >0 works,data > in text file is 1 > > On Tue, Jul 7, 2009 at 12:17 PM, Henrique > Dallazuanna<www...@gmail.com> wrote: > > Try this: > > > > MyResults.GroupA <- subset(MyResults, PosType == 1) > > > > > <SNIP> > > Darn those small screen fonts. I never noticed that! Every example I'm > looking at jsut looks like a single '=' until you pointed it out! > > Thanks to everyone who responded. > > Cheers, > Mark > > ______________________________________________ > 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. > ______________________________________________ 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.
