Opened 3 years ago
Last modified 18 months ago
#21444 needs_review defect
SR.wild and maxima don't mix
Reported by: | nbruin | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | symbolics | Keywords: | |
Cc: | rws | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
This came up in ask-sage:
sage: tanh(SR.wild(0)) #for references; this works tanh($0) sage: coth(SR.wild(0)) ValueError: The name "" is not a valid Python identifier.
The traceback shows that this error happens when trying to parse back a maxima result with bare _SAGE_VAR_
in it (i.e., a sage variable with an empty name)
It seems #20134 is implicated.
Another problem arises when a wildcard expression gets sent to maxima:
sage: sin(SR.wild(0)).simplify_full() TypeError: ECL says: THROW: The catch MACSYMA-QUIT is undefined.
It may be that we can resolve both errors by ensuring that wildcards roundtrip properly to maxima (e.g., convert them to _SAGE_WILDCARD_0
rather than the syntactically illegal _SAGE_VAR_$0
and parse them back properly too).
It may also be that by giving coth
and friends a slightly different treatment we can get them in line with tanh
etc.
Change History (7)
comment:1 Changed 3 years ago by
- Component changed from PLEASE CHANGE to symbolics
comment:2 Changed 3 years ago by
- Type changed from PLEASE CHANGE to defect
comment:3 follow-up: ↓ 4 Changed 3 years ago by
comment:4 in reply to: ↑ 3 Changed 3 years ago by
This works in 7.4beta3, i.e., the
coth(SR.wild(0))
part, not the simplify of course.
I was figuring that a Pynac upgrade might do it, because I remembered you adding those functions recently. Should we have one ticket just to doctest that works, and then leave this ticket for the round-trip issue?
comment:5 Changed 3 years ago by
Yes please.
comment:6 Changed 3 years ago by
See #21455
comment:7 Changed 18 months ago by
- Milestone changed from sage-7.4 to sage-duplicate/invalid/wontfix
- Status changed from new to needs_review
Probably a duplicate of #16335.
This works in 7.4beta3.