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Showing content from http://nbviewer.ipython.org/github/rasbt/matplotlib-gallery/blob/master/ipynb/heatmaps.ipynb below:

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from math import ceil
import numpy as np
from matplotlib import pyplot as plt

# Sample from a bivariate Gaussian distribution
mean = [0,0]
cov = [[0,1],[1,0]] 
x, y = np.random.multivariate_normal(mean, cov, 10000).T


size = len(plt.cm.datad.keys())
all_maps = list(plt.cm.datad.keys())

new_maps = ['viridis', 'inferno', 'magma', 'plasma']

counter = 0
for i in xrange(4):
    plt.subplot(1, 4, counter + 1)
    
    plt.imshow(hist, cmap=new_maps[counter])
    plt.title(new_maps[counter])
    counter += 1

plt.tight_layout()
plt.show()

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