[Numpy-discussion] ufunc delegation to object method

Warren Weckesser warren.weckesser@enthought....
Thu Feb 2 00:04:11 CST 2012


Bump...

On Mon, Jan 30, 2012 at 1:17 AM, Warren Weckesser <
warren.weckesser@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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