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Is there a constant that stores the machine epsilon in R?
384
Machine epsilon or machine precision is an upper bound on the relative approximation error due to rounding in floating point arithmetic. This value characterizes computer arithmetic in the field of numerical analysis, and by extension in the subject of computational science.
Machine epsilon (the smallest number recognized by the computer as very much greater than zero as well as dwarf in magnitude and when added to 1 produces a different number). The machine epsilon (in double precision) is eps =2.220446049250313e−016. It is obtained when the number of terms is n =53.
Try .Machine$double.eps -- and .Machine which on my 32-bit Linux machine yields this:
R> .Machine $double.eps [1] 2.220e-16 $double.neg.eps [1] 1.110e-16 $double.xmin [1] 2.225e-308 $double.xmax [1] 1.798e+308 $double.base [1] 2 $double.digits [1] 53 $double.rounding [1] 5 $double.guard [1] 0 $double.ulp.digits [1] -52 $double.neg.ulp.digits [1] -53 $double.exponent [1] 11 $double.min.exp [1] -1022 $double.max.exp [1] 1024 $integer.max [1] 2147483647 $sizeof.long [1] 4 $sizeof.longlong [1] 8 $sizeof.longdouble [1] 12 $sizeof.pointer [1] 4 R> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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