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Add power-law normalization #1204

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Merged
merged 5 commits into from
Apr 4, 2014
Merged

Add power-law normalization #1204

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9b29988
colors: Replace docstring ''' with """
bgamari Sep 11, 2012
ddd5899
test_colors: Fix typo
bgamari Nov 27, 2013
1b9fc6c
colors: Add power-law normalization
bgamari Sep 11, 2012
48998c1
power_norm_demo: Initial commit
bgamari Jan 22, 2013
d5343c0
hist2d: Add a note mentioning PowerNorm
bgamari Jan 22, 2013
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power_norm_demo: Initial commit
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@bgamari
bgamari committed Mar 10, 2014
commit 48998c1595e291239cd049a881a09a95d98534a3
27 changes: 27 additions & 0 deletions examples/api/power_norm_demo.py
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#!/usr/bin/python

from matplotlib import pyplot as plt
import matplotlib.colors as mcolors
import numpy as np
from numpy.random import multivariate_normal

data = np.vstack([multivariate_normal([10, 10], [[3, 5],[4, 2]], size=100000),
multivariate_normal([30, 20], [[2, 3],[1, 3]], size=1000)
])

gammas = [0.8, 0.5, 0.3]
xgrid = np.floor((len(gammas) + 1.) / 2)
ygrid = np.ceil((len(gammas) + 1.) / 2)

plt.subplot(xgrid, ygrid, 1)
plt.title('Linear normalization')
plt.hist2d(data[:,0], data[:,1], bins=100)

for i, gamma in enumerate(gammas):
plt.subplot(xgrid, ygrid, i + 2)
plt.title('Power law normalization\n$(\gamma=%1.1f)$' % gamma)
plt.hist2d(data[:, 0], data[:, 1],
bins=100, norm=mcolors.PowerNorm(gamma))

plt.subplots_adjust(hspace=0.39)
plt.show()