healpy.pixelfunc.nside2order¶
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healpy.pixelfunc.
nside2order
(nside)¶ Give the resolution order for a given nside.
Parameters: nside : int
healpix nside parameter; an exception is raised if nside is not valid (nside must be a power of 2, less than 2**30)
Returns: order : int
corresponding order where nside = 2**(order)
Notes
Raise a ValueError exception if nside is not valid.
Examples
>>> import healpy as hp >>> import numpy as np >>> hp.nside2order(128) 7
>>> np.all([hp.nside2order(2**o) == o for o in range(30)]) True
>>> hp.nside2order(7) Traceback (most recent call last): ... ValueError: 7 is not a valid nside parameter (must be a power of 2, less than 2**30)