[Numpy-discussion] {zeros, empty, ...}_like functions behavior with subclasses

Wes McKinney wesmckinn at gmail.com
Mon Feb 28 17:52:14 EST 2011

I'm having some trouble with the zeros_like function via np.fix:

def zeros_like(a):
    if isinstance(a, ndarray):
        res = ndarray.__new__(type(a), a.shape, a.dtype, order=a.flags.fnc)
        return res
        wrap = a.__array_wrap__
    except AttributeError:
        wrap = None
    a = asarray(a)
    res = zeros(a.shape, a.dtype)
    if wrap:
        res = wrap(res)
    return res

As you can see this is going to discard any metadata stored in a
subtype. I'm not sure whether this is a bug or a feature but wanted to
bring it up.


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