On Mon, Jul 13, 2009 at 7:12 PM, Darren Dale <dsdale24@gmail.com> wrote:
2009/7/13 Stéfan van der Walt <stefan@sun.ac.za>
Hi Darren
2009/7/13 Darren Dale <dsdale24@gmail.com>:
I've put together a first cut at implementing __array_prepare__, which appears to work, and I would like to request feedback. Here is an overview of the approach:
This is pretty neat! Do you have a quick snippet at hand illustrating its use?
That would be helpful, wouldn't it? The attached script is a modified version of RealisticInfoArray from http://docs.scipy.org/doc/numpy/user/basics.subclassing.html . It should yield the following output:
starting with [0 1 2 3 4] which is of type <class '__main__.MyArray'> and has info attribute = "information" subtracting 3 from [0 1 2 3 4] subtract calling __array_prepare__ on [0 1 2 3 4] input output array is now of type <class '__main__.MyArray'> output array values are still uninitialized: [139911601789568 39578752 139911614885536 39254560 48] __array_prepare__ is updating info attribute on output __array_prepare__ finished, subtract ufunc is taking over subtract calling __array_wrap__ on [0 1 2 3 4] input output array has initial value: [-3 -2 -1 0 1] __array_wrap__ is setting output endpoints to 0 yielding [ 0 -2 -1 0 0] which is of type <class '__main__.MyArray'> and has info attribute = "new_information"
This is a gentle ping, hoping to get some feedback so this feature has a chance of being included in the next release. Darren