Hi all:
Pardon my re-post of this message. I forgot to update the subject
line.
Thanks to those who worked on closing ticket 6243 regarding
derivatives as dictionary keys for the release of Sage 4.1.1. It
appears that there's still a bug, though (see below).
Alex
----------------------------------------------------------------------
| Sage Version 4.1.1, Release Date: 2009-08-14
|
| Type notebook() for the GUI, and license() for information.
|
----------------------------------------------------------------------
sage: f= function('f',x)
sage: d= {}
sage: for i in [1..5]:
....: print diff(f,x,i)
....: d[diff(f,x,i)] = i
....:
D[0](f)(x)
D[0, 0](f)(x)
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
/Users/arai021/<ipython console> in <module>()
/Applications/sage/local/lib/python2.6/site-packages/sage/symbolic/
expression.so in sage.symbolic.expression.Expression.__nonzero__
(sage/
symbolic/expression.cpp:7659)()
/Applications/sage/local/lib/python2.6/site-packages/sage/symbolic/
expression.so in sage.symbolic.expression.Expression.test_relation
(sage/symbolic/expression.cpp:9032)()
/Applications/sage/local/lib/python2.6/site-packages/sage/rings/
complex_interval_field.pyc in __call__(self, x, im)
286
287 try:
--> 288 return x._complex_mpfi_( self )
289 except AttributeError:
290 pass
/Applications/sage/local/lib/python2.6/site-packages/sage/symbolic/
expression.so in sage.symbolic.expression.Expression._complex_mpfi_
(sage/symbolic/expression.cpp:5329)()
/Applications/sage/local/lib/python2.6/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)
/Applications/sage/local/lib/python2.6/site-packages/sage/symbolic/
expression_conversions.pyc in arithmetic(self, ex, operator)
1424 return base ** expt
1425 else:
-> 1426 return reduce(operator, map(self, operands))
1427
1428 def composition(self, ex, operator):
/Applications/sage/local/lib/python2.6/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)
/Applications/sage/local/lib/python2.6/site-packages/sage/symbolic/
expression_conversions.pyc in derivative(self, ex, operator)
344 NotImplementedError: derivative
345 """
--> 346 raise NotImplementedError, "derivative"
347
348 def arithmetic(self, ex, operator):
NotImplementedError: derivative
--~--~---------~--~----~------------~-------~--~----~
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