[Numpy-discussion] performing operations in-place in numpy
Thu Jul 9 09:51:25 CDT 2009
On Thu, Jul 09, 2009 at 09:35:06AM +0000, Pauli Virtanen wrote:
> Thu, 09 Jul 2009 10:03:47 +0100, Citi, Luca kirjoitti:
> > Excuse me if I insist, PyArray_Conjugate is not the problem. If when
> > using the numpy API, it is accepted something like:
> > obj1 = PyArray_CreateSomehowAnArray(....);
> > obj2 = PyArray_DoSomethingWithArray(obj1,...);
> > obj3 = PyArray_DoSomethingElseWithArray(obj1,...);
> > Py_DECREF(obj1);
> > then there is no way my patch is guaranteed to not break things.
> So it seems.
> PyUFunc_GenericFunction is a part of the public C-API, so I guess this
> discussion is moot. I doubt we can change ufunc semantics at this point,
> and I don't see ways in which one could distinguish between "temporary
> arrays" and refcount-1 arrays used in extension modules.
OK, so from what I understand, the proposed change what induce a major
change on the C API. So it seems that we can't just merge it in.
However, I really like the idea: I think it is a simple and clever
optimisation, that is transparent to the user. Do you think it is
possible to keep it around, think about it, and merge it in later, eg in
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