On Tue, Apr 20, 2010 at 6:24 AM, Jason Grout <jason-s...@creativetrax.com> wrote: > On 04/20/2010 07:25 AM, William Stein wrote: >> >> On Monday, April 19, 2010, Tom Boothby<tomas.boot...@gmail.com> wrote: >>> >>> +1 to consistency. IMHO, imprecise fields should represent their zero >>> as 0.0, as floats do. >> >> Jason's patch does not do that.... >> > > That's right. In Sage, notice that RR(0) does not print out 0.0, it prints > out 0.000000000000000. Here is what happens after my patch: > > sage: CDF(0) > 0.0 > sage: CC(0) > 0.000000000000000 > sage: float(0) > 0.0 > sage: complex(0,0) > 0j > > Note that after the patch, CDF and CC are consistent with RDF and RR. That > means that CC and RR are not consistent with a python float or python > complex.
And what is your argument for that choice? > Thanks, > > Jason > > > > >> >>> >>> On Mon, Apr 19, 2010 at 8:31 PM, Jason Grout >>> <jason-s...@creativetrax.com> wrote: >>>> >>>> Look at this inconsistency: >>>> >>>> sage: RR(0) >>>> 0.000000000000000 >>>> sage: RDF(0) >>>> 0.0 >>>> >>>> >>>> However: >>>> >>>> sage: CDF(0) >>>> 0 >>>> sage: CC(0) >>>> 0 >>>> >>>> >>>> Shouldn't CDF(0) and CC(0) also print out decimals like RR(0) and >>>> RDF(0)? >>>> >>>> I've posted a very small patch which does this on >>>> http://trac.sagemath.org/sage_trac/ticket/8720. However, of course, >>>> this >>>> necessitates changing lots of doctests. Before going through all of >>>> that >>>> work, I thought I'd bring it up for comment here. What do people think? >>>> >>>> Thanks, >>>> >>>> Jason >>>> >>>> -- >>>> 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 >>>> >>> >>> -- >>> 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 >>> >> > > > -- > 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 > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- 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
