Opened 5 years ago
Closed 4 years ago
#21428 closed defect (fixed)
AssertionError plotting real part of complex function with float coefficients
Reported by:  paulmasson  Owned by:  

Priority:  major  Milestone:  sage7.4 
Component:  symbolics  Keywords:  
Cc:  Merged in:  
Authors:  Ralf Stephan, Paul Masson  Reviewers:  Paul Masson, Ralf Stephan 
Report Upstream:  N/A  Work issues:  
Branch:  8c1e1eb (Commits, GitHub, GitLab)  Commit:  8c1e1ebcd96e48c8be6a9b79382e864c9daad059 
Dependencies:  Stopgaps: 
Description
Attempting this plot produces the error:
sage: plot(real(sqrt(x  1.*I)), (x,0,1)) ... /Users/Masson/Downloads/GitHub/sage/src/sage/symbolic/pynac.pyx in sage.symbolic.pynac.py_atan2 (/Users/Masson/Downloads/GitHub/sage/src/build/cythonized/sage/symbolic/pynac.cpp:18694)() 1740 from sage.symbolic.constants import pi 1741 parent = parent_c(x) > 1742 assert parent is parent_c(y) 1743 if parent is ZZ: 1744 parent = RR AssertionError:
Reported in this ask question.
Change History (11)
comment:1 Changed 5 years ago by
 Branch set to u/rws/assertionerror_plotting_real_part_of_complex_function_with_float_coefficients
comment:2 Changed 5 years ago by
 Commit set to 13e72f347581f2836b5a9bbaef21035b2af4cbc7
 Status changed from new to needs_review
comment:3 Changed 5 years ago by
 Reviewers set to Paul Masson
 Status changed from needs_review to needs_work
Solves the plot problem, but needs doctests for arguments with different parents to illustrate the change.
Also, there are uncommitted changes for Pynac 0.6.9.1 that get included when this branch is checked out. They belong on another branch and ticket.
comment:4 Changed 5 years ago by
This simple change is likely to have future repercussions. Wouldn't it make more sense to determine both parents and use whichever is more general?
comment:5 Changed 5 years ago by
 Branch u/rws/assertionerror_plotting_real_part_of_complex_function_with_float_coefficients deleted
 Commit 13e72f347581f2836b5a9bbaef21035b2af4cbc7 deleted
comment:6 Changed 5 years ago by
 Branch set to u/paulmasson/21428
comment:7 Changed 5 years ago by
 Commit set to 791b564fdfd53186df76f6d7dbb4cf059d1aab28
 Status changed from needs_work to needs_review
This modification allows plotting to function without invalidating existing doctests.
New commits:
791b564  Allow plotting to function

comment:8 Changed 4 years ago by
 Commit changed from 791b564fdfd53186df76f6d7dbb4cf059d1aab28 to 45a6b64db5302d8aaf6a17bd85f300c47c53e0d5
Branch pushed to git repo; I updated commit sha1. New commits:
45a6b64  Merge develop

comment:9 Changed 4 years ago by
 Branch changed from u/paulmasson/21428 to u/paulmasson/214281
comment:10 Changed 4 years ago by
 Commit changed from 45a6b64db5302d8aaf6a17bd85f300c47c53e0d5 to 8c1e1ebcd96e48c8be6a9b79382e864c9daad059
 Reviewers changed from Paul Masson to Paul Masson, Ralf Stephan
 Status changed from needs_review to positive_review
I think this is okay, and it tests fine with ptestlong.
New commits:
8c1e1eb  Allow plotting to function

comment:11 Changed 4 years ago by
 Branch changed from u/paulmasson/214281 to 8c1e1ebcd96e48c8be6a9b79382e864c9daad059
 Resolution set to fixed
 Status changed from positive_review to closed
New commits:
21428: be permissive in py_atan2