Re: [R] a < b < c is alway TRUE

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From: David Meyer (david.meyer@ci.tuwien.ac.at)
Date: Fri 06 Jul 2001 - 20:27:54 EST 

Message-id: <3B4592AA.9E81F29F@ci.tuwien.ac.at>

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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Vienna University of Technology		A-1040 Vienna/AUSTRIA
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