Status: Accepted
Owner: asmeurer
Labels: Type-Defect Priority-Medium
New issue 1929 by asmeurer: diff bugs
http://code.google.com/p/sympy/issues/detail?id=1929
In [3]: print diff(f(x, y, z), x, y, z, 2)
D(f(x, y, z), z, x, y, z)
In [4]: print diff(f(x, y, z), x, y, z, 2, evaluate=False)
D(f(x, y, z), x, y, z, z)
And also,
In [6]: print diff(-z + x/y, (z, x, y))
[D(-z + x/y, z), D(-z + x/y, x), D(-z + x/y, y)]
The second is easy to fix (just move the kwargs.setdefault line in diff()
to the top of the function),
but I run into test problems with the first.
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