#7508: hash collisions for derivatives of symbolic functions - act 3
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Reporter: burcin | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.3
Component: symbolics | Keywords: pynac
Work_issues: | Author:
Reviewer: | Merged:
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Reported by Alex Raichev on sage-support:
{{{
----------------------------------------------------------------------
| Sage Version 4.2.1, Release Date: 2009-11-14 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: X= var('x,y,z')
sage: f= function('f',*X); f
f(x, y, z)
sage: d= {}
sage: for l in [1..2]:
....: for s in UnorderedTuples(X,l):
....: print diff(f,s)
....: d[diff(f,s)]= 69
....:
D[0](f)(x, y, z)
D[1](f)(x, y, z)
D[2](f)(x, y, z)
D[0, 0](f)(x, y, z)
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call
last)
...
/Applications/sage/local/lib/python2.6/site-packages/sage/symbolic/
expression_conversions.py in derivative(self, ex, operator)
344 NotImplementedError: derivative
345 """
--> 346 raise NotImplementedError, "derivative"
347
348 def arithmetic(self, ex, operator):
NotImplementedError: derivative
}}}
This is another form of the problem I couldn't fix in #6243 and #6851.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7508>
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