healpy.pixelfunc.order2npix

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healpy.pixelfunc.order2npix#

healpy.pixelfunc.order2npix(order)#

Give the number of pixels for the given resolution order.

Parameters:
orderint

the resolution order

Returns:
npixint

corresponding number of pixels

Notes

A convenience function that successively applies order2nside then nside2npix to order.

Examples

>>> import healpy as hp
>>> hp.order2npix(7)
196608

>>> print(hp.order2npix(np.arange(8)))
[    12     48    192    768   3072  12288  49152 196608]

>>> hp.order2npix(31)
Traceback (most recent call last):
    ...
ValueError: 2147483648 is not a valid nside parameter (must be a power of 2, less than 2**30)
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