[Numpy-discussion] Masked array fill_value
Sat Jul 19 18:20:44 CDT 2008
On Saturday 19 July 2008 18:41:22 Ryan May wrote:
> > There was a thread about this a couple months ago, and Pierre GM
> > explained it. I think the point was that indexing is giving you a new
> > masked scalar, which is therefore taking the default mask value of the
> > type. I don't see it as a problem; you can always specify the fill
> > value explicitly when you need to.
Actually, in that example, a is THE masked scalar: that's a constant
initialized when you import numpy.ma, it doesn't depend on the type.
> I thought it sounded familiar. You're right, it's not a big problem, it
> just seemed unintuitive. Thanks for the explaination.
It is in a way, but it's needed for compatibility with older code. That way,
you can test whether a value is masked by using:
a is masked
Yeah, you could also check whether the mask if not nomask and whether the mask
at this particular element is True, but it's a bit longer.
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