On Fri, Sep 18, 2009 at 7:06 AM, Jason Grout <jason-s...@creativetrax.com> wrote: > > Robert Bradshaw wrote: >> On Sep 17, 2009, at 3:16 PM, David Harvey wrote: >> >>> I disagree with this change. One of the main purposes of interval >>> arithmetic is to be able to take a function f(x) that operates on >>> floats, and pass in intervals instead, to determine the possible range >>> of outputs a given input interval could produce. This change violates >>> that paradigm. The author of f(x) shouldn't need to care whether they >>> are operating on floats or intervals. >> >> +1. The smallest possible value for floor is a different thing (and >> contains less information) than all possible values of floor, and >> "all possible values" characterizes the interval arithmetic operations. >> > > > +1 to this reasoning, which means -1 for changing round() and friends. > > Jason >
I feel like there is currently no natural way to get integers from intervals, which makes them quite frustrating and awkward to work with. I don't really care if the "natural way" is called "round", but I want *something*. sage: a = RIF(1.5,2.3) sage: a.<tab> a.abs a.csch a.overlaps a.absolute_diameter a.db a.parent a.additive_order a.diameter a.prec a.alea a.dump a.real a.algdep a.dumps a.relative_diameter a.arccos a.exp a.rename a.arccosh a.exp2 a.reset_name a.arccoth a.floor a.save a.arccsch a.fp_rank_diameter a.sec a.arcsech a.intersection a.sech a.arcsin a.is_NaN a.simplest_rational a.arcsinh a.is_exact a.sin a.arctan a.is_int a.sinh a.arctanh a.is_nilpotent a.sqrt a.base_extend a.is_one a.square a.base_ring a.is_unit a.square_root a.category a.is_zero a.str a.ceil a.log a.subs a.ceiling a.log10 a.substitute a.center a.log2 a.tan a.contains_zero a.lower a.tanh a.cos a.magnitude a.union a.cosh a.mignitude a.upper I see no way to easily get 1 2 or 3 from a. William --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
