> > It would be less surprising if there were no rows omitted in the (B) case.
-integer(0) is identical to integer(0), so how could '[' handle them
differently?
> Yes. It is surprising. It is also teh reason why the construction is also not
> returning what a
> user might expect:
>
> dat[-which(dat$id >5), ]
> #[1] id let
> #<0 rows> (or 0-length row.names)
>
> (And yes I know that many people never use which with a logical. I'm just not
> one of
> those for what I consider good reasons.)
>
> `subset` may be preferred, at least for console interaction:
>
> subset( dat, !(id >5) )
Preferring to use which(logical) is ok, as long as you are careful, but
subset() will not let you use which().
> subset(dat, -which(id>5))
Error in subset.data.frame(dat, -which(id > 5)) :
'subset' must evaluate to logical
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf
> Of David Winsemius
> Sent: Wednesday, October 30, 2013 10:28 AM
> To: Jack Tanner
> Cc: r-h...@stat.math.ethz.ch
> Subject: Re: [R] omitting integer(0) rows from data frame
>
>
> On Oct 30, 2013, at 6:04 AM, Jack Tanner wrote:
>
> > I'm not sure if this is correct behavior or not, but it seems
> > counterintuitive
> > to me:
> >
> > dat <- data.frame(id=1:5, let=letters[1:5])
> > # A. omits the first row
> > dat[- 1, ]
> >
> > # B. unexpectedly omits ALL rows
> > dat[- integer(0), ]
> >
> > It would be less surprising if there were no rows omitted in the (B) case.
>
> Yes. It is surprising. It is also teh reason why the construction is also not
> returning what a
> user might expect:
>
> dat[-which(dat$id >5), ]
> #[1] id let
> #<0 rows> (or 0-length row.names)
>
> (And yes I know that many people never use which with a logical. I'm just not
> one of
> those for what I consider good reasons.)
>
> `subset` may be preferred, at least for console interaction:
>
> subset( dat, !(id >5) )
> id let
> 1 1 a
> 2 2 b
> 3 3 c
> 4 4 d
> 5 5 e
>
> --
>
> David Winsemius
> Alameda, CA, USA
>
> ______________________________________________
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> 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.
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