#6923: Matrix numerical approximation converts complex to real
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Reporter: Henryk.Trappmann | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.3
Component: linear algebra | Keywords:
Work_issues: | Author:
Reviewer: | Merged:
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Changes (by AlexGhitza):
* component: algebra => linear algebra
* milestone: => sage-4.3
Old description:
> sage: A = Matrix(CC,3); A.parent()[[BR]]
> Full MatrixSpace of 3 by 3 dense matrices over Complex Field with 53 bits
> of precision[[BR]]
> sage: B = A.n(20); B.parent()[[BR]]
> Full MatrixSpace of 3 by 3 dense matrices over Real Field with 20 bits of
> precision[[BR]]
>
> IMHO .n() only should change the precision, no other conversion.[[BR]]
>
> This is also the behaviour of .n() on ComplexField.
New description:
{{{
sage: A = Matrix(CC,3); A.parent()
Full MatrixSpace of 3 by 3 dense matrices over Complex Field with 53 bits
of precision
sage: B = A.n(20); B.parent()
Full MatrixSpace of 3 by 3 dense matrices over Real Field with 20 bits of
precision
}}}
IMHO .n() only should change the precision, no other conversion.
This is also the behaviour of .n() on ComplexField.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6923#comment:2>
Sage <http://www.sagemath.org>
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