Updates:
Labels: -Caching Core
Comment #3 on issue 3969 by [email protected]: Problem with caching and
evaluating derivatives with Dummy's
http://code.google.com/p/sympy/issues/detail?id=3969
It *does* work for me without cache:
sk@darkstar:~/src/sympy $ ./bin/isympy -C -q
Welcome to pylab, a matplotlib-based Python environment [backend: TkAgg].
For more information, type 'help(pylab)'.
IPython console for SymPy 0.7.4.1-git (Python 2.7.3-64-bit) (ground types:
gmpy, cache: off)
In [1]: from sympy.abc import a, b, f
In [2]: y1, y2 = Dummy('y'), Dummy('y')
In [3]: func1 = f(a + y1 * b)
In [4]: func2 = f(a + y2 * b)
In [5]: func1_y = func1.diff(y1)
In [6]: func2_y = func2.diff(y2)
In [7]: func1_y == func2_y
Out[7]: True
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