On Wednesday, 26 September 2012 00:54:44 UTC+8, Rob Beezer wrote: > > To summarize some of this discussion more carefully: > > Eigenvalues of a symmetric rational matrix should already land in the > algebraic field (AA), so there is no need to convert them. Error messages > appear to come from QQbar, since much of the functionality of AA is > contained in the same module as QQbar. > > sage: G = graphs.GridGraph([2,3]) > sage: spec = G.spectrum(); spec > [2.414213562373095?, 1, 0.4142135623730951?, -0.4142135623730951?, -1, > -2.414213562373095?] > sage: spec[0].parent() > Algebraic Field >
they should, but they don't. Look: sage: a=AA(1) Algebraic Real Field sage: b=QQbar(1) sage: b.parent() Algebraic Field So this is a bug... -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To post to this group, send email to sage-devel@googlegroups.com. To unsubscribe from this group, send email to sage-devel+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel?hl=en.
