[Numpy-discussion] ANN: NumPy 1.2.0
Pauli Virtanen
pav at iki.fi
Mon Sep 29 06:28:28 EDT 2008
Mon, 29 Sep 2008 12:07:53 +0200, Matthieu Brucher wrote:
>>>>> np.log(-1 + 0j)
>> 3.1415926535897931j
>>>>> np.log(-1 - 1e-99j)
>> -3.1415926535897931j
>>>>> np.log(-1 + 1e-99j)
>> 3.1415926535897931j
>>
>> I'd guess this is typically harmless, but may lead to problems if your
>> code relies on the choice of branch at the branch cut.
>>
>> Could you check if this is really the case? If log seems to work OK,
>> then it's a problem with the test and not the functions.
>
> The result is what you expected.
Do you mean that the problem is with the test, or with the branch cut of
log?
--
Pauli Virtanen
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