On Sun, Nov 28, 2010 at 01:53:05PM -0800, Jeff Newmiller wrote:
> FAQ 7.31
> 
> http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f

Additional information concerning rounding errors of double precision and 
suggestions for R code, which avoids them in some situations, may be found
in the first section of
  http://rwiki.sciviews.org/doku.php?id=misc:r_accuracy
and in
  http://rwiki.sciviews.org/doku.php?id=misc:r_accuracy:decimal_numbers

Petr Savicky.

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