[R] Machine accurancy.

Kenneth Cabrera krcabrer at epm.net.co
Sun Jun 9 13:18:58 CEST 2002

Hi, R-users and developers!

I want to know if it is possible to modify some numeric precision on a 
windows based machine.
I mean, .Machine() function give me some limits of precision based on my 
machine and OS, but
I would like to know if I can modify those characteristics from R.
May I change some C++ library by other and recompile R?
Is it possible to use some specific processor characteristics?
I'm using R in a W2K O.S, and with an Intel PIII, machine.
Are those characteristics R better on a LINUX O.S. machine on the same 
PIII processor?
Is it better to use R in the LINUX platform than in W2K with regards 
this machine precision?

Thank you very much for your help


double.eps             2.220446e-16
double.neg.eps      1.110223e-16
double.xmin           2.225074e-308
double.xmax          1.797693e+308
double.base           2
double.digits          53
double.rounding     5
double.guard         0
double.ulp.digits    -52
double.neg.ulp.digits -53
double.exponent      11
double.min.exp      -1022
double.max.exp       1024
integer.max              2147483647
sizeof.long               4
sizeof.longlong         8
sizeof.longdouble     12

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