[Numpy-discussion] read-only or immutable masked array

[Stéfan van der Walt]

On Fri, Jul 12, 2013 at 4:41 PM, Gregorio Bastardo
<gregorio.bastardo at gmail.com> wrote:
> array.flags.writeable = False
>
> is perfectly fine, but it does not work on ma-s. Moreover, mask
> hardening only protects masked elements, and does not raise error (as
> I'd expect).

You probably have to modify the underlying array and mask:

x = np.ma.array(...)
x.mask.flags.writeable = False
x.data.flags.writeable = False

Stéfan