[R] a < b < c is alway TRUE
Peter Malewski
peter.malewski at gmx.de
Fri Jul 6 12:50:44 CEST 2001
I forgot the explanation: R (and s+3) evalutes from left to right and
converts logical to numeric. see below.
On Fri, Jul 06, 2001 at 12:48:01PM +0200, Peter Malewski wrote:
>
> > 3 < 2
> [1] FALSE
> > F < 1
> [1] TRUE
> > as.numeric(F)
> [1] 0
>
>
> p.
>
>
> On Fri, Jul 06, 2001 at 12:08:51PM +0200, Monika Ferster wrote:
> > Uwe Ligges writes:
> > > One of our students did something like:
> > >
> > > x[a < b < c]
> > >
> > > instead of
> > >
> > > x[a < b & b < c]
> > >
> > >
> > > But why is
> > >
> > > 3 < 2 < 1 # [1] TRUE ???
> > >
> >
> > 3 < 2 < 1 seems to be seen like a double no because 3 < 2 < 1 < 0 returns
> > F. It looks like the multiplication of -1 what is strange, because F
> > corresponds to the value 0. So if you do (3<2)*(2<1) you get 0 and not the
> > value of T (=1).
> > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
> > r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> > Send "info", "help", or "[un]subscribe"
> > (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
> > _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
>
> --
> P.Malewski, Limmerstr.47, 30451 Hannover, 0511-2135008
> At work: http://www.MH-Hannover.de 0511 532 3194 / Fax: 0511 532 3190,
> P.Malewski at tu-bs.de, peter.malewski at gmx.de, malewski.peter at mh-hannover.de.
--
P.Malewski, Limmerstr.47, 30451 Hannover, 0511-2135008
At work: http://www.MH-Hannover.de 0511 532 3194 / Fax: 0511 532 3190,
P.Malewski at tu-bs.de, peter.malewski at gmx.de, malewski.peter at mh-hannover.de.
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
More information about the R-help
mailing list