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The current implementation of
cube_noise
is quite slow, and a lot slower than it needs to be for datasets that have planes/channels fully flagged.This small improvement now checks whether the plane is fully flagged and if so, sets the
noise
andskymedian
tonp.nan
right away instead of doing a bunch of useless NaN calculations.This will be particularly important for non-uniform frequency coverage if the users implementation is "simply add NaN channels to make the frequency coverage uniform"