[Numpy-discussion] Ill-defined in-place operations (#1085)

Matthieu Brucher matthieu.brucher@gmail....
Wed Apr 15 15:43:56 CDT 2009


2009/4/15  <josef.pktd@gmail.com>:
> On Wed, Apr 15, 2009 at 4:34 PM, Matthieu Brucher
> <matthieu.brucher@gmail.com> wrote:
>> I think this is unavoidable. If we state clearly that every numpy
>> function assums non-pointer aliasing, then people have to care about
>> this themselves (like they would in Fortran, or in C++ for object-like
>> arrays).
>
>
> "non-pointer aliasing"
>
> this might be clear for those that come from fortran or c++.
> But for those that come from matlab or gauss, the intuition is  "what
> you see is what you get", and I have no idea what "non-pointer
> aliasing" is.

It happens when an output pointer is also used as an input (with a
potential offset). And even Fortran, C or C++ programmers don't know
what it is :|


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