[Rd] V2.9.0 changes [Sec=Unclassified]

2009-06-22 Thread Troy Robertson
Hi all, Prefix: I am a frustrated Java coder in R. I am coding a medium sized ecosystem modelling program in R. I have changed to using S4 objects and it has cost me an order of magnitude in execution speed over the functional model. I cannot afford this penalty and have found that it is

Re: [Rd] Floating point precision / guard digits? (PR#13771)

2009-06-22 Thread Kasper Daniel Hansen
On Jun 20, 2009, at 6:45 , Dr. D. P. Kreil wrote: I am sorry if I am not from the field and although I have had some basic background in numerics that has been more than a decade ago. If you can suggest an online resource to help me use the right vocabulary and better understand the fundamental

Re: [Rd] Floating point precision / guard digits? (PR#13771)

2009-06-22 Thread Charles Geyer
On Sat, 20 Jun 2009 08:44:21 -0400 Stavros Macrakis wrote: > d) if it is important to your application to perform exact arithmetic > on rational numbers (and I suspect it is not), you might want to use > that instead of floating-point. But even if implemented in R, most R > calculations cannot us