On Wed, Jun 11, 2008 at 11:32 AM, Ondrej Certik <[EMAIL PROTECTED]> wrote: > On Tue, Jun 10, 2008 at 11:04 PM, mabshoff <[EMAIL PROTECTED]> wrote: >> >> Riccardo Gori wrote: >>> Hello, >>> >> >> Hi Riccardo, >> >> thanks for the bug report. I have forwarded it to sage-devel. >> >> Cheers, >> >> Michael >>> In SAGE-3.0.2 with a Intel Mac OSX 10.5 I found the following bug: >>> >>> Trying to evaluate a sympy function gives a wrong result. With sympy in a >>> python shell everything works well. >>> >>> To reproduce: >>> >>> sage: import sympy >>> sage: sympy.sin(1.1) >>> sin(1) >>> sage: sympy.sin(float(1.2)) >>> sin(1) >>> sage: sympy.sin(1.3) >>> sin(1.300000000000000044408920985) >>> sage: sympy.sin(float(1.4)) >>> sin(1.39999999999999991118215803) >>> >>> I didn't find a way to get a correct result even with float(). > > I created an issue for that: > > http://code.google.com/p/sympy/issues/detail?id=881 > > It's a serious bug. However, so far I cannot reproduce it nor in > sympy, nor in sage: > > sage: import sympy > sage: sympy.sin(float(1.1)) > sin(1.10000000000000008881784197) > sage: sympy.sin(1.1) > sin(1.10000000000000008881784197) > > I'll dig further and fix this in the next release of sympy.
Ok, I reproduced it, one needs to just start sage and do: sage: import sympy sage: sympy.sin(1.1) sin(1) if you start sage and do: sage: import sympy sage: sympy.sin(float(1.1)) sin(1.10000000000000008881784197) sage: sympy.sin(1.1) sin(1.10000000000000008881784197) it works. I'll look into it and fix it. Ondrej --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@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-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
