Re: [Numpy-discussion] Conversion functions between Numeric and numarray arrays?

[Francesc A. <fa...@op...>]

A Dimarts 21 Gener 2003 19:41, Sebastian Haase va escriure:
> Hi,
> I think this is actually quite related to my post from Friday:
> [Numpy-discussion] make C array accessible to python without copy
>
> -> So, to reformulate: Who hold actually the array data in memory? Or:
> where gets the memory allocated and where/how many pointers to that exi=
st?=20
>   I understood the answer that Todd Miller gave, that there is such a t=
hing
> as a "buffer object" that does all the work, so then: one would just ha=
ve
> to take that and build a "new" numarray or Numeric structure around it=20
> (referring to the Subject of this email)   or  (in the case of my
> Friday-email)  just have that "buffer object" point to a different memo=
ry
> space (that got already allocated by the C-program) .
>
> Agree ? (Did I get it right?)

Well, so so. I think the buffer object is a property of numarray objects,
not Numeric objects. So, in the numarray =3D=3D> Numeric conversion proce=
ss you
may need to access the internals of the buffer (for example by using the
high level numarray C-API) and manage to obtain a data buffer (in the C
sense, not an object) that can be used to build the Numeric object (with =
the
help of the numarray object metadata). The opposite way needs something
similar but with inverted roles. See my previous message for a more in-de=
pth
explanation.

I think the conversion (without copying) is not a difficult process, but =
no
so-easy like that.

Well, I'm just a newcomer to numarray and my opinions about that may
perfectly be completely wrong, of course. Take them with caution!.

--=20
Francesc Alted