Comment #1 on issue 2476 by smi...@gmail.com: nth order Derivative
http://code.google.com/p/sympy/issues/detail?id=2476
If this worked, our current Derivative should work:
>>> Derivative(x**3, x, a)
D(x**3, x, a)
>>> _.subs(a, 3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\basic.py", line 735, in subs
return self._subs_old_new(old, new)
File "sympy\core\cache.py", line 103, in wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "sympy\core\basic.py", line 744, in _subs_old_new
return self._eval_subs(old, new)
File "sympy\core\function.py", line 719, in _eval_subs
raise NotImplementedError("Derivatives evaluated at a point are not
yet impl
emented.")
NotImplementedError: Derivatives evaluated at a point are not yet
implemented.
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