the smallest positive floating-point numberx such that1 + x != 1. It equalsdouble.base ^ ulp.digits if eitherdouble.base is 2 ordouble.rounding is 0; otherwise, it is(double.base ^ double.ulp.digits) / 2. Normally2.220446e-16.

a small positive floating-point numberxsuch that1 - x != 1. It equalsdouble.base ^ double.neg.ulp.digits ifdouble.base is 2ordouble.rounding is 0; otherwise, it is(double.base ^ double.neg.ulp.digits) / 2. Normally1.110223e-16. Asdouble.neg.ulp.digits is boundedbelow by-(double.digits + 3),double.neg.eps may notbe the smallest number that can alter 1 by subtraction.

the smallest non-zero normalizedfloating-point number, a power of the radix, i.e.,double.base ^ double.min.exp. Normally2.225074e-308.

the largest normalized floating-point number.Typically, it is equal to(1 - double.neg.eps) * double.base ^ double.max.exp, buton some machines it is only the second or third largest suchnumber, being too small by 1 or 2 units in the last digit of thesignificand. Normally1.797693e+308. Note that largerunnormalized numbers can occur.

the radix for the floating-point representation:normally2.

the number of base digits in the floating-pointsignificand: normally53.

the rounding action, one of
0 if floating-point addition chops;
1 if floating-point addition rounds, but not in the IEEE style;
2 if floating-point addition rounds in the IEEE style;
3 if floating-point addition chops, and there is partial underflow;
4 if floating-point addition rounds, but not in the IEEE style, andthere is partial underflow;
5 if floating-point addition rounds in the IEEE style, and there ispartial underflow.
Normally5.

the number of guard digits for multiplicationwith truncating arithmetic. It is 1 if floating-point arithmetictruncates and more thandouble digits base-double.base digitsparticipate in the post-normalization shift of the floating-pointsignificand in multiplication, and 0 otherwise.
Normally0.

the largest negative integeri suchthat1 + double.base ^ i != 1, except that it is bounded below by-(double.digits + 3). Normally-52.

the largest negative integerisuch that1 - double.base ^ i != 1, except that it is boundedbelow by-(double.digits + 3). Normally-53.

the number of bits (decimal places ifdouble.base is 10) reservedfor the representation of the exponent (including the bias or sign)of a floating-point number. Normally11.

the largest in magnitude negative integeri such thatdouble.base ^ i is positive and normalized. Normally-1022.

the smallest positive power ofdouble.base that overflows. Normally1024.

the largest integer which can be represented.Always2^31 - 1 = 2147483647.

the number of bytes in a Clong type:4 or8 (most 64-bit systems, but not Windows).

the number of bytes in a Clong longtype. Will be zero if there is no such type, otherwise usually8.

the number of bytes in a Clong doubletype. Will be zero if there is no such type (or its use wasdisabled whenR was built), otherwise possibly12 (most 32-bit builds),16 (most 64-bit builds) or 8(CPUs such as ARM where for most compilerslong double isidentical todouble).

the number of bytes in a CSEXPtype. Will be4 on 32-bit builds and8 on 64-bitbuilds ofR.

introduced inR 4.0.0. Whencapabilities("long.double") is true, there are 10 such"longdouble.<kind>" values, specifying thelong doubleproperty corresponding to its"double.*" counterpart. Seealso ‘Note’.