[R] Strange result when subsetting a data frame based on a character variable

[Jim Lemon]

peter dalgaard wrote:

> O2 < 2d < O3 had been even stranger, no?

Don't give those dudes in Cupertino any more bright ideas, okay?

Jim

On Wed, Nov 18, 2015 at 12:11 PM, peter dalgaard <pdalgd at gmail.com> wrote:

>
> > On 18 Nov 2015, at 01:59 , Jeff Newmiller <jdnewmil at dcn.davis.CA.us>
> wrote:
> >
> > Are you sure that wasn't oh-3 rather than 03?
>
> Sure I'm sure. I even cut+pasted the filenames from the offending dir...
> It's all just Apple trying to be helpful (and failing, again).
>
> O2 < 2d < O3 had been even stranger, no?
>
> -p
>
> >
> ---------------------------------------------------------------------------
> > Jeff Newmiller                        The     .....       .....  Go
> Live...
> > DCN:<jdnewmil at dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live
> Go...
> >                                      Live:   OO#.. Dead: OO#..  Playing
> > Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
> > /Software/Embedded Controllers)               .OO#.       .OO#.
> rocks...1k
> >
> ---------------------------------------------------------------------------
> > Sent from my phone. Please excuse my brevity.
> >
> > On November 17, 2015 1:57:15 PM PST, peter dalgaard <pdalgd at gmail.com>
> wrote:
> >>
> >>> On 17 Nov 2015, at 20:37 , Bert Gunter <bgunter.4567 at gmail.com>
> >> wrote:
> >>>
> >>>> 2 == "2"
> >>> [1] TRUE
> >>>
> >>> ?"=="  says:
> >>>
> >>> "If the two arguments are atomic vectors of different types, one is
> >>> coerced to the type of the other, the (decreasing) order of
> >> precedence
> >>> being character, complex, numeric, integer, logical and raw."
> >>>
> >>>> as.character(99999)
> >>> [1] "99999"
> >>>> as.character(100000)
> >>> [1] "1e+05"
> >>>> as.character(100000) == "100000"
> >>> [1] FALSE
> >>>
> >>
> >> Also notice that, for similar reasons
> >>
> >>> 10 > "2"
> >> [1] FALSE
> >>
> >> (At least in most collations. I recently discovered that OSX Finder
> >> sorted 2dnorm.R between 02-Probability.toc and
> >> 03-Combinatorics-2x2.pdf.)
> >
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>

	[[alternative HTML version deleted]]