On Fri, Sep 18, 2009 at 7:13 PM, Craig Citro <craigci...@gmail.com> wrote: > >> I really think that floor, ceil, and round should return intervals when >> they are fed intervals. I thought that was the whole point of interval >> arithmetic. Shouldn't sin(floor(interval)) be an interval? It won't >> be if floor automatically converts things to integers. Why should >> floor, ceil, and round get special treatment to yank things out of >> interval arithmetic? Why not other functions too? It seems that having >> some functions that yank you out of interval arithmetic sort of spoil >> everything. >> > > Well, I'm a little confused -- I thought that the whole point of > floor() and ceil() was to return Integers. Indeed: > > sage: x = 3.12312 > sage: type(x) > <type 'sage.rings.real_mpfr.RealLiteral'> > sage: type(x.floor()) > <type 'sage.rings.integer.Integer'> > sage: x = RDF(x) > sage: type(x.floor()) > <type 'sage.rings.integer.Integer'> > sage: x = RealField(100)(x) > sage: type(x.floor()) > <type 'sage.rings.integer.Integer'> > > So I think that this suggests returning an Integer is the right move > -- it's just a question of what to do if there *is* no single correct > integer.
A huge +1 to this! 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 -~----------~----~----~----~------~----~------~--~---
