[R] a < b < c is alway TRUE
David Meyer
david.meyer at ci.tuwien.ac.at
Fri Jul 6 12:27:54 CEST 2001
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 is FALSE=0, and 0<1 is always 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).
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--
Mag. David Meyer Wiedner Hauptstrasse 8-10
Vienna University of Technology A-1040 Vienna/AUSTRIA
Department for Statistics, Probability Tel.: (+431) 58801/10772
Theory and Actuarial Mathematics mail: david.meyer at ci.tuwien.ac.at
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