this is a (very) Frequently Asked Question; check:
http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f
Best,
Dimitris
wolfgang.siewert wrote:
Try this:
0.7-0.3==0.4
(We get FALSE)
0.7-0.3<0.4
(We get TRUE)
but
0.8-0.3==0.5
(TRUE)
0.8-0.3<0.5
(FALSE)
Funny, he?
There is a way around:
round(0.7-0.3,1)==0.4
(TRUE)
Obviously there is a problem with some combinations of decimal subtractions,
that - we have the feeling - shouldt be solved.
Best regards
Sven & Wolfgang
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
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