Opened 8 years ago
Closed 7 years ago
#12708 closed defect (fixed)
limit not correctly computed by maxima
Reported by: | ppurka | Owned by: | burcin |
---|---|---|---|
Priority: | critical | Milestone: | sage-5.9 |
Component: | calculus | Keywords: | maxima limit |
Cc: | Merged in: | sage-5.9.beta0 | |
Authors: | Punarbasu Purkayastha | Reviewers: | Karl-Dieter Crisman |
Report Upstream: | Fixed upstream, in a later stable release. | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
This is taken from the google notebook bug report page.
sage: limit(tanh(x),x=0) x
On the other hand, this works
sage: limit(tanh(x),x=0,taylor=True) 0
It is a bug in Maxima, and is still present in sage-5.0beta8. This beta apparently has maxima-5.26, the latest released version of Maxima.
Update: It has been fixed upstream. It is in maxima-5.27
Patch attached with doctest. Apply trac_12708-doctest_limit.patch
Attachments (1)
Change History (16)
comment:1 Changed 8 years ago by
- Report Upstream changed from N/A to Reported upstream. Little or no feedback.
comment:2 Changed 8 years ago by
Yup.
Maxima 5.26.0 http://maxima.sourceforge.net using Lisp ECL 11.1.1 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) limit(tanh(x),x,1); (%o1) tanh(1) (%i2) limit(tanh(x),x,0); (%o2) x
Ah, ppurka, you already reported upstream... in the meantime I had already created one. I closed the duplicate, I guess we were both working on this at the same time. Sorry.
comment:3 Changed 8 years ago by
- Description modified (diff)
- Report Upstream changed from Reported upstream. Little or no feedback. to Fixed upstream, but not in a stable release.
- Stopgaps set to todo
comment:4 Changed 8 years ago by
- Description modified (diff)
- Report Upstream changed from Fixed upstream, but not in a stable release. to Fixed upstream, in a later stable release.
comment:5 Changed 7 years ago by
Maxima 5.28 is now out.
comment:6 Changed 7 years ago by
This should be fixed by #13364.
comment:7 Changed 7 years ago by
- Status changed from new to needs_review
comment:8 Changed 7 years ago by
- Milestone changed from sage-5.8 to sage-duplicate/invalid/wontfix
- Reviewers set to Punarbasu Purkayastha
- Status changed from needs_review to positive_review
- Stopgaps todo deleted
Works for me. It has been merged in 5.7.
comment:9 Changed 7 years ago by
- Status changed from positive_review to needs_work
But it needs a patch to verify that is has been fixed and doesn't regress.
comment:10 follow-up: ↓ 12 Changed 7 years ago by
- Description modified (diff)
- Keywords maxima limit removed
- Milestone changed from sage-duplicate/invalid/wontfix to sage-5.9
- Reviewers Punarbasu Purkayastha deleted
- Status changed from needs_work to needs_review
This should be doctested in maxima, IMHO :/
comment:11 Changed 7 years ago by
- Keywords maxima limit added
comment:12 in reply to: ↑ 10 ; follow-up: ↓ 14 Changed 7 years ago by
This should be doctested in maxima, IMHO :/
Usually they do in fact add tests for bug fixes. Nonetheless, Sage has a long history of adding redundancy. For instance, if we for some reason switched to sympy or native limits, we would still want this to work. Or if somehow Maxima didn't test for exactly the same thing, we would notice if a very similar version worked but this failed.
comment:13 Changed 7 years ago by
- Reviewers set to Karl-Dieter Crisman
- Status changed from needs_review to positive_review
comment:14 in reply to: ↑ 12 Changed 7 years ago by
Replying to kcrisman:
This should be doctested in maxima, IMHO :/
Usually they do in fact add tests for bug fixes. Nonetheless, Sage has a long history of adding redundancy. For instance, if we for some reason switched to sympy or native limits, we would still want this to work. Or if somehow Maxima didn't test for exactly the same thing, we would notice if a very similar version worked but this failed.
I agree. Even if the doctest is redundant, better test twice than not at all.
comment:15 Changed 7 years ago by
- Merged in set to sage-5.9.beta0
- Resolution set to fixed
- Status changed from positive_review to closed
Reported upstream