Oh I see...
It's not that "-7" gets coerced to numeric, but 0 gets coerced to "0".
Of course...
On Tue, Jun 25, 2024 at 11:02 AM Martin Maechler <maech...@stat.math.ethz.ch>
wrote:
> >>>>> Adrian Dusa
> >>>>> on Tue, 25 Jun 2024 10:56:07 +0300 writes:
>
> > Dear R fellows,
>
> >> From time to time, just when I thought I knew my R, I get
> >> bitten by some
> > small things that reminds one to constantly return to the
> > basics.
>
> > I knew for instance that "-1" < 0 is TRUE, presumably
> > because R first coerces to numeric before comparing with
> > 0.
>
> > But I did not expect that "--" < 0 is a TRUE statement.
> > (and the same holds for any string prepended by a minus
> > sign, e.g. "-a" < 0)
>
> > I would be grateful for an explanation, I'm sure that
> > something very obvious escapes me but it sure does seem
> > counter intuitive to me.
>
> > Best wishes, Adrian
>
> > [[alternative HTML version deleted]]
>
> Nice, quiz, yes.
>
> You must have forgotten that all Op's (+,-, <= , &, | ..)
> must coerce to common type.
>
> ... and so does c() where coercion is defined a bit more.
>
> --> does c("--", 0) give you a clue, now ?
>
[[alternative HTML version deleted]]
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