Hi Marius,
as others already noted, you request something which is beyond the
numeric resolution.
That's also elaborated in the famous FAQ 7.31
(https://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f).
As you know - according to IEEE 754 a binary in double precision holds
64 bits (where 1 bit is the sign, 11 the exponent, and 52 the mantissa).
That translates into ~15.7 digits decimal. Hence, the 16th digit is noise.
IMHO, print(foo, digits = bar) should provide the result but
additionally throw for any bar > 15 a message like
"From the hard-/software to the wetware: We cannot provide what you were
asking for."
Helmut
--
Ing. Helmut Schütz
BEBAC – Consultancy Services for
Bioequivalence and Bioavailability Studies
Neubaugasse 36/11
1070 Vienna, Austria
W https://bebac.at/
F https://forum.bebac.at/
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