The lazy fields are not just wrappers around self._value: sage: a = RLF(0.1) sage: RealIntervalField(150)(a) 0.1000000000000000000000000000000000000000000000? sage: RealIntervalField(150)(a._value) 0.10000000000000000555111512312578270211815834046?
On Monday, May 8, 2017 at 8:50:48 PM UTC+2, Thierry (sage-googlesucks@xxx) wrote: > > Hi, > > RealLazyField() and ComplexLazyField() claim to be exact, but currently > they are not: > > sage: RLF.is_exact() > True > sage: a = RLF(0.1) ; a > 0.10000000000000001? > sage: a._value > 0.100000000000000 > sage: a._value.parent() > Real Field with 53 bits of precision > > Also, the doc explicitely states: > > This class represents the set of real numbers to unspecified > precision. For the most part it simply wraps exact e lements and > defers evaluation until a specified precision is requested. > > I opened https://trac.sagemath.org/ticket/22960 but i am not sure whether > RLF should stop claiming it is exact or whether we should forbid things > like RLF(0.1), what do you think (the first is easier to implement) ? > > Ciao, > Thierry > > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
