a < b < c is alway TRUE

----- Original Message -----
From: "Till Baumgaertel" <till.baumgaertel at epost.de>
To: <r-help at stat.math.ethz.ch>
Cc: "Uwe Ligges" <ligges at statistik.uni-dortmund.de>
Sent: Friday, July 06, 2001 5:21 AM
Subject: Re: [R] a < b < c is alway TRUE

  3 < 2 < 1 # [1] TRUE ???

this is evaluated from left to right:
(3<2)<1

3<2 = FALSE
FALSE<1 = TRUE

what's surprising is the following:

FALSE<1

[1] TRUE

FALSE>1

[1] FALSE

TRUE<1

[1] FALSE

TRUE>1

[1] FALSE

because of symmetry i'd expect TRUE>1 to be TRUE.

TRUE is being treated as equal to 1, so TRUE >= 1, returns TRUE. However,
non-zero values are treated as TRUE when coercing numerical values.

as.logical(c(-2,-1,-.5,0,.5,1,2))

[1]  TRUE  TRUE  TRUE FALSE  TRUE  TRUE  TRUE

-Bill

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