Opened 7 years ago
Closed 6 years ago
#9947 closed defect (fixed)
expression not in canonical form
Reported by: | zimmerma | Owned by: | burcin |
---|---|---|---|
Priority: | major | Milestone: | sage-4.7.1 |
Component: | symbolics | Keywords: | pynac |
Cc: | Merged in: | sage-4.7.1.alpha1 | |
Authors: | Richard Kreckel, Burcin Erocal | Reviewers: | Karl-Dieter Crisman |
Report Upstream: | Fixed upstream, in a later stable release. | Work issues: | |
Branch: | Commit: | ||
Dependencies: | #11317 | Stopgaps: |
Description (last modified by )
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.
Attachments (1)
Change History (6)
Changed 7 years ago by
comment:1 Changed 7 years ago by
- Component changed from calculus to symbolics
- Description modified (diff)
- Keywords pynac added
- Report Upstream changed from N/A to Fixed upstream, in a later stable release.
- Status changed from new to needs_work
- Summary changed from output bug in GiNaC to expression not in canonical form
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.
comment:2 Changed 6 years ago by
- Dependencies set to 11317
- Status changed from needs_work to needs_review
New pynac package with the fix is at #11317.
comment:3 Changed 6 years ago by
- Reviewers set to Karl-Dieter Crisman
- Status changed from needs_review to positive_review
Looks ok. Same comment as at #9891.
For instance, one could then allow an spkg maintainer to review the upstream fix. But that's not exactly what we want.
comment:4 Changed 6 years ago by
- Dependencies changed from 11317 to #11317
- Milestone changed from sage-4.7 to sage-4.7.1
comment:5 Changed 6 years ago by
- Merged in set to sage-4.7.1.alpha1
- Resolution set to fixed
- Status changed from positive_review to closed
add doctest