It is now ticket number 5451: see http://trac.sagemath.org/sage_trac/ticket/5451
John Cremona 2009/3/7 John Cremona <john.crem...@gmail.com>: > 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 -~----------~----~----~----~------~----~------~--~---
