I did not know that. Thanks for the clear explanation. Nicolas
On Feb 12, 2013, at 19:25 , Jaime Fernández del Río wrote: > On Tue, Feb 12, 2013 at 9:53 AM, Nicolas Rougier <nicolas.roug...@inria.fr> > wrote: > Did I do something wrong or is it expected behavior ? > > Try: > > print (Z.view('f4'))[:50].base.base is Z # True > print Z[:50].view('f4').base.base is Z # True > > This weird behaviour is fixed in the just-released numpy 1.7. From the notes > of the release: > > The ``.base`` attribute on ndarrays, which is used on views to ensure that the > underlying array owning the memory is not deallocated prematurely, now > collapses out references when you have a view-of-a-view. For example:: > > a = np.arange(10) > b = a[1:] > c = b[1:] > > In numpy 1.6, ``c.base`` is ``b``, and ``c.base.base`` is ``a``. In numpy 1.7, > ``c.base`` is ``a``. > > Jaime > > -- > (\__/) > ( O.o) > ( > <) Este es Conejo. Copia a Conejo en tu firma y ayúdale en sus planes de > dominación mundial. > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@scipy.org > http://mail.scipy.org/mailman/listinfo/numpy-discussion _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion