Opened 7 years ago
Closed 6 years ago
#18832 closed defect (fixed)
non-numeric non-symbolic BuiltinFunction arguments
Reported by: | rws | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | symbolics | Keywords: | |
Cc: | jdemeyer | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | #20312 | Stopgaps: |
Description (last modified by )
Symbolic expressions can be seen as programs for applying functions to numerics and symbolics. Non-numeric non-symbolics (NNNS, most of the rest of Sage) are usually not handled by symbolic functions, although they often allow the same operations and many of the functions. The manual workaround is to evaluate the expression "on x
" and then to substitute x
with the respective NNNS. We propose that BuiltinFunction
automates this process.
Part of this is already duplicated in rings.arith
but the need arises with symbolic functions returning polynomials, e.g. #16813. At the moment BuiltinFunction
simply converts the NNNS argument, losing the type information.
Practically, BuiltinFunction
should eval with x
, try substitution, and throw an error if the substitution leads to unknown methods of the NNNS. I.e.
sage: elliptic_f (x, 1) log(tan(1/4*pi + 1/2*x)) sage: elliptic_f (polygen(CC), 1) ... AttributeError: cannot apply function to argument x: argument does not know how to do log (coming from this exception) AttributeError: 'Polynomial_generic_dense_field' object has no attribute 'log'
Change History (7)
comment:1 Changed 7 years ago by
- Description modified (diff)
comment:2 Changed 7 years ago by
- Description modified (diff)
comment:3 Changed 6 years ago by
- Dependencies set to #20312
comment:4 Changed 6 years ago by
comment:5 Changed 6 years ago by
- Milestone changed from sage-6.8 to sage-duplicate/invalid/wontfix
- Status changed from new to needs_review
comment:6 Changed 6 years ago by
- Status changed from needs_review to positive_review
comment:7 Changed 6 years ago by
- Resolution set to fixed
- Status changed from positive_review to closed
The example is not the best.