Hi all,
I've reported two bugs in solve on trac, seemingly due to bugs in our
interface with Maxima.
1. Ticket #20755 <http://trac.sagemath.org/ticket/20755>: the bug
implies wrong answers when invoking roots on symbolic expressions:
sage: w = x^4 - (1+3*i)*x^3 - (2-4*i)*x^2 + (6-2*i)*x- 4 - 4*i
sage: len(w.roots()) # incorrect
2
sage: len(w.roots(ring=QQbar)) # correct
4
2. Ticket #20346 <http://trac.sagemath.org/ticket/20436>: the bug
implies a TypeErrorwhen invoking solve with option "to_poly_solve":
sage: p= x^10 - 10*x^8 + 35*x^6 + x^5 - 50*x^4 - 5*x^3 +
25*x^2 + 5*x- 1
sage: p.solve(x, to_poly_solve=True)
Traceback(most recent call last):
...
TypeError: 'sage.symbolic.expression.Expression' object doesnot support
indexing
In the tickets, I described as precisely as I can the origin of the
bugs. Yet I do not understand the interface well enough to fix them. If
somebody with a better understanding than me can have a look, it would
be great!
Thanks,
Bruno
--
You received this message because you are subscribed to the Google Groups
"sage-devel" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-devel+unsubscr...@googlegroups.com.
To post to this group, send email to sage-devel@googlegroups.com.
Visit this group at https://groups.google.com/group/sage-devel.
For more options, visit https://groups.google.com/d/optout.
