[Numpy-discussion] in the NA discussion, what can we agree on?

[Gary Strangman]

For the non-destructive+propagating case, do I understand correctly that 
this would mean I (as a user) could temporarily decide to IGNORE certain 
portions of my data, perform a series of computation on that data, and the 
IGNORED flag (or however it is implemented) would be propagated from 
computation to computation? If that's the case, I suspect I'd use it all 
the time ... to effectively perform data subsetting without generating 
(partial) copies of large datasets. But maybe I misunderstand the 
intended notion of propagation ...

Gary


> Or put another way, do you think that the MISSING and IGNORED concepts
> are adequate to cover practical use cases, or do you have an example
> where what's really wanted is say non-destructive + propagating? I can
> see how it would work, but I don't think I'd ever use it, so I'm
> curious...
>
> -- Nathaniel
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