On Wed, Mar 7, 2012 at 1:05 PM, Neal Becker <ndbecker2@gmail.com> wrote:

I'm wondering what is the use for the ignored data feature?

I can use:

A[valid_A_indexes] = whatever

to process only the 'non-ignored' portions of A. So at least some simple cases
of ignored data are already supported without introducing a new type.

OTOH:

w = A[valid_A_indexes]

will copy A's data, and subsequent use of

w[:] = something

will not update A.

Is this the reason for wanting the ignored data feature?

Suppose you are working with plotted data and want to turn points on/off by clicking on them interactively to see how that affects a fit. Why make multiple copies, change sizes, destroy data, and all that nonsense? Just have the click update the mask and redraw.

Chuck