[PYTHON] Specify the color in the matplotlib 2D map

Specify cmap to specify the color with matplotlib

import numpy as np
import matplotlib.pyplot as plt

x = np.random.random((100, 100))
plt.imshow(x, cmap="GnBu")
plt.colorbar()

tmp.png

I've specified GnBu (I think it's Green-Blue) here, but there are many other colors defined: http://matplotlib.org/examples/color/colormaps_reference.html

Many of these have opposite colors (such as _r followed by: gray_r).

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