potential r bug (floor)
On Tue, 24 Jun 2003, kjetil brinchmann halvorsen wrote:
On 23 Jun 2003 at 20:20, Prof Brian D Ripley wrote:
Why is this a bug? If you take apply floor to a number that you expect to be exactly 3, but compute it on a binary computer via logs to base e, you must expect some rounding error. BTW, on my Windows XP machine I do get
floor(log10(1000))
[1] 3
On my windows XP machine (R1.7.1) i get:
floor( log10(1000) )
[1] 2 Why this difference between different XP machines?
Different DLLs, no doubt. Possibly also different chips. The real question is why *you* expected them to be the same?
Brian D. Ripley, ripley@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595