On Sep 30, 2009, at 6:05 PM, Douglas Bates wrote:
On Wed, Sep 30, 2009 at 2:32 PM, Peter Dalgaard<p.dalga...@biostat.ku.dk
> wrote:
Martin Batholdy wrote:
hum,
can you explain that a little more detailed?
Perhaps I miss the background knowledge - but it seems just absurd
to me.
0.1+0.1+0.1 is 0.3 - there is no rounding involved, is there?
why is
x <- 0.1 + 0.1 +0.1
not equal to
y <- 0.3
Remember that this is in BINARY arithmetic. It's really not any
stranger
than the fact that 1/3 + 1/3 != 2/3 in finite accuracy decimal
arithmetic
(0.33333 + 0.33333 = 0.66666 != 0.66667).
In an earlier thread on this theme I believe that someone quoted Brian
Kernighan as saying "10 times 0.1 is hardly ever 1" but I haven't been
able to track down the quote. Can anyone point us to such a quote?
It summarizes the situation succinctly,
Number 36 according to this example of "way beyond fair-use":
http://cs.boisestate.edu/~amit/teaching/handouts/style.pdf
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
