#9947: expression not in canonical form
----------------------------------------------+-----------------------------
Reporter: zimmerma | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.6
Component: symbolics | Keywords: pynac
Author: Richard Kreckel, Burcin Erocal | Upstream: Fixed upstream,
in a later stable release.
Reviewer: | Merged:
Work_issues: |
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Changes (by newvalueoldvalue):
* status: new => needs_work
* author: => Richard Kreckel, Burcin Erocal
* component: calculus => symbolics
* upstream: N/A => Fixed upstream, in a later stable release.
* keywords: => pynac
Old description:
> {{{
> sage: a.imag()
> sin(1/2*arctan2(0, -88* + 1))*sqrt(abs(4*(sqrt(3) - 5)*(sqrt(3) + 5) +
> 1))
> }}}
> See the output of the second argument of {{{arctan2}}}.
> See also #9913.
New description:
In some cases GiNaC leaves `numeric` objects in the terms of an `add`:
{{{
sage: a=(sqrt(4*(sqrt(3) - 5)*(sqrt(3) + 5) + 48) + 4*sqrt(3))/ (sqrt(3) +
5)
sage: a.imag()
sin(1/2*arctan2(0, -88* + 1))*sqrt(abs(4*(sqrt(3) - 5)*(sqrt(3) + 5) + 1))
}}}
See the output of the second argument of {{{arctan2}}}.
The term `-88*` is generated by the `expair` `-22*4`. This term should be
moved to the overall coefficient.
See also #9913.
--
Comment:
This was fixed in GiNaC by Richard Kreckel. Here is the relevant patch:
http://www.ginac.de/ginac.git?p=ginac.git;a=commitdiff;h=e08cda1854bdb82f6706ec269233577690ae00e4
I applied the patch to pynac, so this will be fixed in the next release.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9947#comment:1>
Sage <http://www.sagemath.org>
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