Comment #5 on issue 2293 by asmeurer: Unexpected limit behaviour
http://code.google.com/p/sympy/issues/detail?id=2293
Yeah, something similar to diff:
In [263]: x.diff(2*x)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/Users/aaronmeurer/Documents/Python/sympy/sympy/<ipython console> in
<module>()
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/expr.py in
diff(self, *symbols, **assumptions)
1474 new_symbols = map(sympify, symbols) # e.g. x, 2, y, z
1475 assumptions.setdefault("evaluate", True)
-> 1476 return Derivative(self, *new_symbols, **assumptions)
1477
1478 def fdiff(self, *indices):
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/core/function.py in
__new__(cls, expr, *symbols, **assumptions)
555
556 if i == iwas: # didn't get an update because of bad
input
--> 557 raise ValueError('Derivative expects Symbol [,
Integer] args but got %s, %s' % (s, count))
558
559 symbol_count.append((s, count))
ValueError: Derivative expects Symbol [, Integer] args but got 2*x, 1
By the way, I just found a bug. x.diff(4) doesn't fail like it should. I
will open a new issue for that.
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