On 29/05/2015 2:36 PM, Lensing, Shelly Y wrote: > Is anyone aware of point.in.polygon giving different results for 32-bit vs. > 64-bit R? Our OS is 64-bit Windows 7 Enterprise. I'm working with someone > else's extensive R program and the final results are close but not exactly > matching. We're thinking it might be something with the point.in.polygon > function (one of many possibilities, including leaps).
Often 32 bit R does calculations slightly more accurately than 64 bit R does. This is because the 64 bit compiler is more likely to do calculations in 64 bit precision when the 32 bit compiler does them in 80 bit precision. Of course, individual calculations being more accurate doesn't mean the final answer is, but small numeric differences in floating point calculations are to be expected. Duncan Murdoch ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
