如何在R中获得机器epsilon？

Question

是否存在将机器epsilon存储在R中的常量？

Answer 1

尝试.Machine$double.eps- .Machine在我的32位Linux机器上产生这个:

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> 

Answer 2

我相信你想要的.Machine$double.eps.