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Message from discussion Pari stack growning out of bounds
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Dima Pasechnik  
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 More options Sep 25 2012, 1:08 pm
From: Dima Pasechnik <dimp...@gmail.com>
Date: Tue, 25 Sep 2012 10:08:13 -0700 (PDT)
Local: Tues, Sep 25 2012 1:08 pm
Subject: Re: Pari stack growning out of bounds
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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...


 
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