I am hoping that someone who has worked on that code, such as Martin Albrecht, might reply as might know what is going on. It should not be too hard to fix.
I could not find a relevant trac ticket so am opening one now. John Cremona 2009/3/7 Alex Lara <lrodr...@gmail.com>: > > Just as I thought. So there is nothing I can do but work with sage > 3.1.1, right? > > Those polynomials arised as coefficients of some polynomials in F_q(t) > [T] and inside a sum command: > > sum ( (do something with H_j(T)) for j in bla bla) > > The routine which gave the error was successfully used many times > before. > > Thanks John. > > ---Alex > > On 7 mar, 05:50, John Cremona <john.crem...@gmail.com> wrote: >> That is definitely a bug. Doing it step by step works: >> >> sage: fd=f.denominator(); gd=g.denominator() >> sage: fn=f.numerator(); gn=g.numerator() >> sage: fn*gd+fd*gn >> 2*t^18 + t^11 + t^10 + 2*t^2 >> sage: hn = fn*gd+fd*gn >> sage: hd = fd*gd >> sage: hn.gcd(hd) >> t^3 + 2*t^2 >> sage: hn/hd >> (2*t^15 + 2*t^14 + 2*t^13 + 2*t^12 + 2*t^11 + 2*t^10 + 2*t^9 + t^7 + >> t^6 + t^5 + t^4 + t^3 + t^2 + t + 1)/(t^17 + t^9 + t) >> >> sage 3.4.alpha0 gives the same thing. >> >> John Cremona >> >> 2009/3/7 Alex Lara <lrodr...@gmail.com>: >> >> >> >> > Hi guys, >> >> > I recently upgrade sage from 3.2.3 to 3.3. I'm also have sage 3.1.1 >> > The thing is that the following commands give different results: >> >> > F.<theta>=FiniteField(9) >> > A.<t> = PolynomialRing(F) >> > K.<t> = FractionField(A) >> > f= 2/(t^2+2*t); g =t^9/(t^18 + t^10 + t^2);f+g >> >> > In 3.1.1 gives the right answer (I guess) but in 3.2.3 give an error: >> >> > ZeroDivisionError Traceback (most recent call >> > last) >> > ... >> > ZeroDivisionError: division by zero in finite field. >> >> > I don't know how those commands work in 3.2.3. >> >> > I had a problem with sage 3.2.3, but Craig Citro helped me. Sage 3.2.3 >> > couldn't open objects created in sage 3.1.1. This objects contain >> > polynomials p(T) in F_q(t)[T]. Perhaps these problems are related. >> >> > Any idea of how to fix that? >> >> > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
