[R] Odd results with %% and conserving memory

[Thomas Lumley]

On Tue, 6 Apr 2010, JustinNabble wrote:

> Likewise, identical( (4.1 * 100 ) %/% 1 , 409 ) returns TRUE on my computer,
> so the result is off by exactly 1, too larger to be explained by floating
> point error.

The result of (4.1 * 100 ) %/% 1 is an integer, so if it doesn't agree exactly it has to be off by at least 1, no matter how high the numerical precision.

    -thomas


Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle