On Dec 23, 1:53 am, Paul Zimmermann <paul.zimmerm...@loria.fr> wrote: > Hi, > > as a followup on the "Arbitrary precision in cython" thread, I'd like to > mention that one can directly use mpfr's implementation from within Sage: > > sage: RealField(150)(10).eint() > 2492.2289762418777591384401439985248489896471 > > It only works for real numbers, but has the advantage to guarantee correct > rounding (for the 150-bit binary result; if you are using the decimal > result above, you have to take into account the binary->decimal conversion > error, which is at most 1/2 ulp).
Actually, Sage doesn't print the entire value for floating-point numbers by default; it leaves a few digits off the end, so the potential binary->decimal conversion error above is a lot more than 1/2 ulp. To get the entire within-1/2-ulp decimal value, you can use: sage: RealField(150)(10).eint().str(truncate=False) '2492.2289762418777591384401439985248489896471010' Carl --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
