Comment #2 on issue 1494 by asmeurer: eq.subs fails for Derivative(u(t)**2,
t**2)
http://code.google.com/p/sympy/issues/detail?id=1494
The bug was that this didn't raise an exception until it got to the subs
line (maybe that's not what the OP meant though :), but this has been fixed:
In [18]: u = Function('u')
In [19]: Derivative(u(t)**2, t**2)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/Users/aaronmeurer/Documents/python/sympy/sympy-scratch/<ipython console>
in <module>()
/Users/aaronmeurer/Documents/python/sympy/sympy-scratch/sympy/core/function.py
in
__new__(cls, expr, *symbols, **assumptions)
656
657 if i == iwas: # didn't get an update because of bad
input
--> 658 raise ValueError('Derivative expects Symbol [,
Integer] args but got %s, %s' % (s, count))
659
660 symbol_count.append((s, count))
ValueError: Derivative expects Symbol [, Integer] args but got t**2, 1
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