Opened 3 years ago
Closed 3 years ago
#22959 closed defect (fixed)
Doctest fix for: series() yields wrong result depending on precision
Reported by:  behackl  Owned by:  

Priority:  blocker  Milestone:  sage8.0 
Component:  calculus  Keywords:  
Cc:  rws  Merged in:  
Authors:  Ralf Stephan  Reviewers:  Benjamin Hackl 
Report Upstream:  N/A  Work issues:  
Branch:  b121061 (Commits)  Commit:  b12106198107961e7a2370c34a2b0738471becc3 
Dependencies:  #22969  Stopgaps: 
Description
In the current 8.0.beta5
I get the following:
sage: f = x/(1x^2) sage: f.series(x==0, 10) 1*x^2 + 1*x^4 + 1*x^6 + 1*x^8 + Order(x^10) sage: f.series(x==0, 11) 1*x + 1*x^3 + 1*x^5 + 1*x^7 + 1*x^9 + Order(x^11)
This seems to be a regression from somewhere between sage7.5
(where the result is still correct) and sage7.6
.
Change History (11)
comment:1 Changed 3 years ago by
comment:2 Changed 3 years ago by
 Report Upstream changed from N/A to Reported upstream. Developers acknowledge bug.
comment:3 Changed 3 years ago by
 Dependencies set to pynac0.7.7
 Report Upstream changed from Reported upstream. Developers acknowledge bug. to Fixed upstream, in a later stable release.
comment:4 Changed 3 years ago by
Nice work!
comment:5 Changed 3 years ago by
 Branch set to u/rws/series___yields_wrong_result_depending_on_precision
comment:6 Changed 3 years ago by
 Commit set to b12106198107961e7a2370c34a2b0738471becc3
 Dependencies changed from pynac0.7.7 to #22969
 Report Upstream changed from Fixed upstream, in a later stable release. to N/A
 Status changed from new to needs_review
 Summary changed from series() yields wrong result depending on precision to Doctest fix for: series() yields wrong result depending on precision
New commits:
b121061  22959: Doctest fix for: series() yields wrong result depending on precision

comment:7 Changed 3 years ago by
 Reviewers set to Benjamin Hackl
Thanks a lot for your work, Ralf! Patch LGTM, I'm happy to set this to positive_review
as soon as the patchbot tested it.
comment:8 Changed 3 years ago by
For your information, the best way to have a patchbot run immediatly on your prefered ticket is to launch your own patchbot yourself on this ticket...
comment:9 Changed 3 years ago by
Replying to chapoton:
For your information, the best way to have a patchbot run immediatly on your prefered ticket is to launch your own patchbot yourself on this ticket...
Usually I'd do that, thanks. :)
However, I'm at a conference and have a very unstable internet connection, so I don't want to build the latest beta on my laptop. And as of a rather unlucky coincidence, my VPN connection to our university servers does not work either, so I also can't start the patchbot we have there.
comment:10 Changed 3 years ago by
 Status changed from needs_review to positive_review
Running make ptestlong
on my laptop lets the test run through, except for being stuck on the has_mathematica()
call in src/sage/doctest/external.py
. I don't think that this problem is related to the changes on this ticket, so this is positive_review
from me.
comment:11 Changed 3 years ago by
 Branch changed from u/rws/series___yields_wrong_result_depending_on_precision to b12106198107961e7a2370c34a2b0738471becc3
 Resolution set to fixed
 Status changed from positive_review to closed
As this means that
series
delivers a mathematically wrong result, I've set the priority toblocker
(and this should *really* be fixed before8.0
).