Status: Accepted
Owner: asmeurer
CC: matt...@gmail.com
Labels: Type-Defect Priority-Medium Simplify Polynomial
New issue 2717 by asmeurer: apart() should automatically include algebraic
numbers in an expression as an extension
http://code.google.com/p/sympy/issues/detail?id=2717
In [1]: apart(z/((z - 2)*(z + I)))
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (17, 0))
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call last)
/Users/aaronmeurer/Documents/python/sympy/sympy/<ipython-input-1-200bdc3632a0>
in
<module>()
----> 1 apart(z/((z - 2)*(z + I)))
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/utilities/decorator.pyc
in
threaded_func(expr, *args, **kwargs)
23 func(expr.rhs, *args,
**kwargs))
24 else:
---> 25 return func(expr, *args, **kwargs)
26
27 return threaded_func
/Users/aaronmeurer/Documents/python/sympy/sympy/sympy/polys/partfrac.pyc in
apart(f, x, full, **args)
36
37 if P.is_multivariate:
---> 38 raise NotImplementedError("multivariate partial fraction
decomposition")
39
40 common, P, Q = P.cancel(Q)
NotImplementedError: multivariate partial fraction decomposition
but,
In [3]: apart(z/((z - 2)*(z + I)), extension=[I])
Out[3]:
1 + 2⋅ⅈ 2⋅(-2 + ⅈ)
───────── - ──────────
5⋅(z + ⅈ) 5⋅(z - 2)
apart() should do this automatically. At any rate, the error message is
not very good, because the expression isn't really multivariate.
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