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How many decimal places of information does R actually use in computation?
2 messages · Xiao He, Bert Gunter
See, e.g. http://en.wikipedia.org/wiki/Double-precision_floating-point_format Also in ?print.default please note: Large number of digits Note that for large values of digits, currently for digits >= 16, the calculation of the number of significant digits will depend on the platform's internal (C library) implementation of sprintf() functionality. -- Bert
On Mon, May 20, 2013 at 6:06 PM, Xiao He <praguewatermelon at gmail.com> wrote:
Dear R-users: Hi, I read here ( http://stackoverflow.com/questions/2287616/controlling-digits-in-r) that R is only accurate up to the 15th decimal place, despite the fact that if you choose to display more decimal places, it will. I wonder if R uses the information beyond the 15th decimal place in actual computation. Thanks! Best, Xiao [[alternative HTML version deleted]]
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Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm