#17547: BuiltinFunction overriding GiNaC function is allowed
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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{{{
sage: from sage.symbolic.function import BuiltinFunction
sage: class AFunction(BuiltinFunction):
....: def __init__(self, name, exp=1):
....: self.exponent=exp
....: BuiltinFunction.__init__(self, name, nargs=1)
....: def _eval_(self, arg):
....: return arg**self.exponent
sage: p2 = AFunction('exp', 2)
sage: p2(x)
e^x
sage: _.function()
() |--> e^x
}}}
The attempt at creation should give an error (plus respective
documentation warnings).
Alternatively, search first for user-defined function names, then GiNaC
core, to allow overriding.
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Ticket URL: <http://trac.sagemath.org/ticket/17547>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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