#10311: solve()-ing Equations in CC
------------------------------+---------------------------------------------
Reporter: tux21b | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone:
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The following looks like a bug to me, but feel free to correct me if I'm
mistaken.
{{{
sage: var('z')
sage: g1 = z^5 - (2 - I)*z^4 - (34 + 13*I)*z^3 + (22 - 51*I)*z^2 \
+ (53 - I)*z - 728 - 196*I == 0
sage:
sage: solve([g1], z)
[0 == z^5 + (I - 2)*z^4 - (13*I + 34)*z^3 - (51*I - 22)*z^2 -
(I - 53)*z - 196*I - 728]
sage:
sage: solve([g1, I == I], z)
[[z == (-4.00420663449 - 1.03443096055*I)], [z == (7.03872088238 +
1.11154206861*I)], [z == (1.40276621 - 2.70758376454*I)], [z == (
-3.78854832152 - 0.122376366114*I)], [z == (1.35126786363 +
1.7528490226*I)]]
sage:
sage: solve([g1, z == z], z)
[[z == (-4.00420663449 - 1.03443096055*I)], [z == (7.03872088238 +
1.11154206861*I)], [z == (1.40276621 - 2.70758376454*I)], [z == (
-3.78854832152 - 0.122376366114*I)], [z == (1.35126786363 +
1.7528490226*I)]]
}}}
I think the problem is that `solve()` refuses to solve equation systems
with more variables than equations, even if some of the variables are
already known.
Regards[[BR]]
Christoph
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10311>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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