On Apr 17, 2009, at 9:29 AM, iuhz7j...@sneakemail.com wrote:
A few further oddities (no longer having to do with modular
arithmetic):
(0.3 * 3) == 0.9
[1] FALSE
(0.2 * 6) == 1.2
[1] FALSE
This is bad behavior, right?
No...
> (0.3 * 3) - 0.9
[1] -1.110223e-16
> (0.2 * 6) - 1.2
[1] 2.220446e-16
However:
> all.equal(0.3 * 3, 0.9)
[1] TRUE
> all.equal(0.2 * 6, 1.2)
[1] TRUE
See ?all.equal
I feel like I'm going crazy.
Only because you don't understand the etiology of the behavior.
Read:
R FAQ 7.31 Why doesn't R think these numbers are equal?
http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f
and call us in the morning.... :-)
HTH,
Marc Schwartz
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