#12801: substitute_function misses some substitutions
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Reporter: nbruin | Owner: burcin
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-5.0
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by mjo):
Even with the patch I don't think the second case is fixed completely. I
was going to add a doctest to `Expression.substitute_function()`, but,
{{{
sage: f = function('f')
sage: g = function('g')
sage: f(g(x)).diff(x).substitute_function(g, sin)
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (38, 0))
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
/home/mjo/src/sage-5.0.beta11/devel/sage-main/<ipython console> in
<module>()
/home/mjo/src/sage-5.0.beta11/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.substitute_function
(sage/symbolic/expression.cpp:16628)()
/home/mjo/src/sage-5.0.beta11/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in __call__(self, ex)
212 div = self.get_fake_div(ex)
213 return self.arithmetic(div, div.operator())
--> 214 return self.arithmetic(ex, operator)
215 elif operator in relation_operators:
216 return self.relation(ex, operator)
/home/mjo/src/sage-5.0.beta11/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in arithmetic(self, ex,
operator)
1572 x*bar(x) + pi/bar(x)
1573 """
-> 1574 return reduce(operator, map(self, ex.operands()))
1575
1576 def composition(self, ex, operator):
/home/mjo/src/sage-5.0.beta11/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in __call__(self, ex)
216 return self.relation(ex, operator)
217 elif isinstance(operator, FDerivativeOperator):
--> 218 return self.derivative(ex, operator)
219 else:
220 return self.composition(ex, operator)
/home/mjo/src/sage-5.0.beta11/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.pyc in derivative(self, ex,
operator)
1611 """
1612 if operator.function() == self.original:
1613 return
operator.change_function(self.new)(*map(self,ex.operands()))
1614 else:
-> 1615 return operator(*map(self, ex.operands()))
/home/mjo/src/sage-5.0.beta11/local/lib/python2.7/site-
packages/sage/symbolic/operators.pyc in __call__(self, *args)
42 if (not all(is_SymbolicVariable(x) for x in args) or
43 len(args) != len(set(args))):
---> 44 raise NotImplementedError, "currently all arguments
must be distinct variables"
45 vars = [args[i] for i in self._parameter_set]
46 return self._f(*args).diff(*vars)
NotImplementedError: currently all arguments must be distinct variables
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12801#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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