Status: New
Owner: plaes800
Labels: Type-Defect Priority-Medium
New issue 1494 by plaes800: eq.subs fails for Derivative(u(t)**2, t**2)
http://code.google.com/p/sympy/issues/detail?id=1494
Following code fails with traceback:
#!/usr/bin/python
from sympy import *
t = Symbol("t")
u, F = map(Function, ['u', 'F'])
eq = Eq(Derivative(u(t)**2, t**2))
print eq
print eq.subs(u(t), F(t))
[/snip]
Traceback (most recent call last):
File "./subs.py", line 17, in <module>
print eq.subs(u(t), F(t))
File "/home/plaes/code/sympy/sympy/core/basic.py", line 971, in subs
return self._subs_old_new(old, new)
File "/home/plaes/code/sympy/sympy/core/cache.py", line 85, in wrapper
func_cache_it_cache[k] = r = func(*args, **kw_args)
File "/home/plaes/code/sympy/sympy/core/basic.py", line 980, in
_subs_old_new
return self._eval_subs(old, new)
File "/home/plaes/code/sympy/sympy/core/relational.py", line 139, in
_eval_subs
return self.__class__(self.lhs._eval_subs(old, new),
self.rhs._eval_subs(old, new))
File "/home/plaes/code/sympy/sympy/core/function.py", line 619, in
_eval_subs
return Derivative(*map(lambda x: x._eval_subs(old, new), self.args),
**{'evaluate': True})
File "/home/plaes/code/sympy/sympy/core/function.py", line 578, in __new__
raise ValueError('Invalid literal: %s is not a valid variable' % s)
ValueError: Invalid literal: t**2 is not a valid variable
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