[Numpy-discussion] read-only or immutable masked array
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Sun Jul 14 09:55:32 EDT 2013
On Jul 13, 2013, at 13:36 , Gregorio Bastardo <gregorio.bastardo at gmail.com> wrote:
> Hi Stéfan,
> Thanks for the suggestion, but it does not protect the array:
Thinking about it, it can't: when `x` is a MaskedArray, `x.data` is just a view of the underlying array as a regular ndarray. As far as I understand, changing the `.flags` of a view doesn't affect the original.
I'm a bit surprised, though. Here's what I tried
>>> x = np.ma.array([1,2,3], mask=[0,1,0])
<<< ValueError: assignment destination is read-only
What did you mean by
>>> array.flags.writeable = False
>>> is perfectly fine, but it does not work on ma-s.
? Could you post what you did and what you got?
>>> Moreover, mask
>>> hardening only protects masked elements, and does not raise error (as
>>> I'd expect).
Yes, that's how it supposed to work.
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