healpy.pixelfunc.order2nside¶
-
healpy.pixelfunc.
order2nside
(order)¶ Give the nside parameter for the given resolution order.
Parameters: order : int
the resolution order
Returns: nside : int
the nside parameter corresponding to order
Notes
Raise a ValueError exception if order produces an nside out of range.
Examples
>>> import healpy as hp >>> hp.order2nside(7) 128
>>> hp.order2nside(np.arange(8)) array([ 1, 2, 4, 8, 16, 32, 64, 128])
>>> hp.order2nside(31) Traceback (most recent call last): ... ValueError: 2147483648 is not a valid nside parameter (must be a power of 2, less than 2**30)