[Numpy-discussion] ndarray: subclassing a subclass looses custom attribute

Sebastian Haase seb.haase@gmail....
Fri Oct 1 04:31:37 CDT 2010

On Fri, Oct 1, 2010 at 11:26 AM, Sebastian Haase <seb.haase@gmail.com> wrote:
> Hi,
> I'm trying to add a 'meta' attribute to ndarray to keep track of image
> data filenames and resolution etc.
> Following  the excellent document
> http://docs.scipy.org/doc/numpy/user/basics.subclassing.html
> this worked right away.
> However, I had done this before for some specific image-file-types:
> those would add there own attribute to ndarray array (e.g. arr.Mrc)
> Now if I call the new  ndarray_meta on my ndarray_with_mrc I loose the
> `Mrc` attribute, leaving only the new `meta` attribute.
> My code is essentially a verbatim copy of
> http://docs.scipy.org/doc/numpy/user/basics.subclassing.html#simple-example-adding-an-extra-attribute-to-ndarray
> What can I do ?
> Thanks,
> Sebastian Haase
Sorry, the code I used is this:

I tried replacing asarray with asanyarray - but that did seem to make
any difference...


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