[Numpy-discussion] ufunc delegation to object method

[Warren Weckesser]

On Thu, Feb 2, 2012 at 12:21 AM, Travis Oliphant <travis at continuum.io>wrote:

> Yes.  This is the behavior.  It was part of the original Numeric
> implementation.    In the code generator file:
>
> numpy/core/code_generators/generate_umath.py
>
> ufuncs with a registered type of 'P' have this behavior.   There is a long
> list of them.
>
> -Travis
>
>

Great, thanks.

Warren



>
> On Feb 2, 2012, at 12:04 AM, Warren Weckesser wrote:
>
> Bump...
>
> On Mon, Jan 30, 2012 at 1:17 AM, Warren Weckesser <
> warren.weckesser at enthought.com> wrote:
>
>> In the following code, numpy.sin() calls the object's sin() function:
>>
>> In [2]: class Foo(object):
>>    ...:     def sin(self):
>>    ...:         return "spam"
>>    ...:
>>
>> In [3]: f = Foo()
>>
>> In [4]: np.sin(f)
>> Out[4]: 'spam'
>>
>> Is this, in fact, guaranteed behavior for a ufunc?  It does not appear to
>> be documented.
>>
>> This question came up in the discussion of SciPy pull request 138 (
>> https://github.com/scipy/scipy/pull/138), where the idea is to add numpy
>> unary ufunc support to SciPy's sparse arrays.
>>
>> (Sorry if this email shows up twice.   I sent it the first time while the
>> Enthought servers were down, and eventually got an email back saying it had
>> not been sent.)
>>
>> Warren
>>
>>
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