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I am new in it, and cant fully understand the manual. I am running test code, but I want to make blank map, without this gradient colors. I think it's not hard for those who know. Help me please.Here what i got

import numpy as np
import healpy as hp
import pylab as pl
import matplotlib as plt

NSIDE = 32
m = np.arange(hp.nside2npix(NSIDE))
hp.mollview(m)
pl.show()
Vadym Voitsekhovskyi
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1 Answers1

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The numpy function np.arange gives out an array increasing from zero to 12288, which is why you have a gradient on your map.

You can replace that line of code to 

m = np.zeros(hp.nside2npix(NSIDE))

if you want to treat blanks in your map as zeros, or to

m = np.full(hp.nside2npix(NSIDE), np.nan)

if you want to use NaN (not a number) value for the blank values on the map.

Vlas Sokolov
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