[Numpy-discussion] Numarray feature request: supporting the buffer interface
prabhu_r at users.sf.net
Fri Jan 7 09:55:10 CST 2005
>>>>> "TM" == Todd Miller <jmiller at stsci.edu> writes:
TM> On Fri, 2005-01-07 at 09:19, Chris Perkins wrote:
>> On Fri, 7 Jan 2005 10:01:37 +0530, Prabhu Ramachandran
>> <prabhu_r at users.sf.net> wrote:
>> > I noticed that numarray does not support this interface. My
>> > feature request is that numarray arrays also support this
>> > buffer interface (if possible).
>> I second this request.
TM> Without looking at code, my guess is that the C source level
TM> compatibility of numarray with Numeric will enable a "direct
TM> graft" of the buffer protocol code from Numeric to numarray.
TM> I think it will be easy... but...
TM> numarray has a concept of "misbehaved arrays", i.e. arrays in
TM> the binary format of another platform and therefore
TM> byte-swapped, or arrays spread across records and therefore
TM> possibly noncontiguous or misaligned. I think these buffers
TM> are likely unusable so providing access to them is a mistake.
TM> Misbehaved arrays probably don't arise in the work of most
TM> users, but they are a possibility that has to be accounted
TM> For cases of misbehaved arrays, I think raising a ValueError
TM> exception is necessary. How does that sound?
I think that sounds reasonable. In my particular use case I always
flatten (ravel) the array before using it as a buffer. I guess that
in cases where the array is non-contiguous or misaligned a copy of the
data is made on ravel so these would not be a problem for me. For
misbehaved arrays, a ValueError with a decent error message would be
Anyway, thanks for considering the feature request!
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