Opened 5 years ago
Closed 5 years ago
#16785 closed defect (fixed)
derivative operator translation to maxima
Reported by: | nbruin | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-6.4 |
Component: | interfaces | Keywords: | |
Cc: | kcrisman, rws, burcin | Merged in: | |
Authors: | Nils Bruin | Reviewers: | Ralf Stephan |
Report Upstream: | N/A | Work issues: | |
Branch: | 9c0f66d (Commits) | Commit: | 9c0f66dca5d59aef571c69fe7561b6446ec23d71 |
Dependencies: | Stopgaps: |
Description
Currently, we are failing to properly convert certain expressions to maxima when they contain differential operators:
sage: function('f') sage: maxima_calculus(f(x).diff(x)) 'diff(f(_SAGE_VAR_x),_SAGE_VAR_x,1) sage: maxima_calculus(f(x+1).diff(x)) #this is bad! ?%at('diff(f(t0),t0,1),[t0=x+1])
note the bare x
in the bottom line. That should be a _SAGE_VAR_
.
As it turns out, a lot of conversion here is happening with string manipulations, circumventing the standard conversion machinery. That also means that functions that have a non-trivial _maxima_init_evaled_
will not get translated using it. It's better to do everything using the standard conversion.
Change History (5)
comment:1 Changed 5 years ago by
- Branch set to u/nbruin/ticket/16785
comment:2 Changed 5 years ago by
- Cc kcrisman rws burcin added
- Commit set to 9c0f66dca5d59aef571c69fe7561b6446ec23d71
- Status changed from new to needs_review
comment:3 Changed 5 years ago by
- Reviewers set to Ralf Stephan
- Status changed from needs_review to positive_review
Passes ptestlong and looks good.
comment:4 Changed 5 years ago by
- Milestone changed from sage-6.3 to sage-6.4
comment:5 Changed 5 years ago by
- Branch changed from u/nbruin/ticket/16785 to 9c0f66dca5d59aef571c69fe7561b6446ec23d71
- Resolution set to fixed
- Status changed from positive_review to closed
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Hopefully these changes do the trick.
maxima_lib.sr_to_max
was already doing something along these lines, so no changes are required there.New commits:
trac #16785: improve differential operator translation to maxima