On Nov 20, 2008, at 1:54 AM, Stan Schymanski wrote: > Thanks a lot for that, Robert!
See http://trac.sagemath.org/sage_trac/ticket/4572 Do you want to review it? > Is the ultimate "fix" the one that will > use pynac instead of maxima? I can't wait for this one. Yep, though we won't be replacing all of maxima's functionality any time soon. > > All the best, > Stan > > On Nov 19, 6:46 pm, Robert Bradshaw <[EMAIL PROTECTED]> > wrote: >> On Nov 18, 2008, at 11:18 PM, Stan Schymanski wrote: >> >>> Hi Robert, >> >>> Will the fix of the interaction with Maxima allow conservation of >>> precision of arguments passed through Maxima? This would satisfy my >>> needs. >> >> Actually, the "fix" is avoiding Maxima for everything symbolic. >> >>> Depending on how long this is going to take, I would like Mike's >>> interim fix to be implemented. It doesn't make anything worse >>> compared >>> with the current state, as currently latexification gives a false >>> sense >>> of precision, anyway. This does certainly not fit my definition of >>> usefulness. We would just have to make sure that the interim fix is >>> removed again when the maxima interaction is fixed. >> >> The problem with Mike's fix is that it affects *all* real numbers, >> not just ones in Maxima expressions. I would be OK with a fix that >> just impacts symbolic object's latex (and even string) >> representation. I'll implement this and see if it gets a positive >> review. >> >> - Robert >> >> >> >>> Robert Bradshaw wrote: >>>> On Nov 18, 2008, at 5:57 AM, Stan Schymanski wrote: >> >>>>> Ah, I see: >> >>>>> dummy1 = RealField(8)(0.1);dummy1 >>>>> 0.10 >> >>>>> dummy2 = RealField(16)(0.1);dummy2 >>>>> 0.1000 >> >>>>> latex(x*dummy1) >>>>> {0.1001 x} >> >>>>> latex(x*dummy2) >>>>> {0.1 x} >> >>>>> This is not quite what one would expect. However, the behaviour >>>>> before >>>>> the fix was not much better in my opinion, as the precision was >>>>> not >>>>> obvious from the latex output, either: >> >>>>> sage: dummy1 = RealField(8)(0.1);dummy1 >>>>> 0.10 >>>>> sage: dummy2 = RealField(16)(0.1);dummy2 >>>>> 0.1000 >>>>> sage: latex(x*dummy1) >>>>> {0.100100000000000 x} >>>>> sage: latex(x*dummy2) >>>>> {0.100000000000000 x} >> >>>>> Obviously, the fix does not fix all the problems, but it does make >>>>> latex output much more useful. Would you agree? >> >>>> That depends on your definition of useful. Personally, I think it's >>>> useful to see how many digits of precision a given number has, and >>>> for most things it works fine. >> >>>> The issue here is the interaction with Maxima, which is being >>>> fixed. >>>> Making it so any latexification of all real numbers is truncated is >>>> (IMHO) not the right fix because one component abuses precisions. >> >>>> - Robert >> >> > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
