matplotlib example nac plot (snippet)

Python matplotlib example 'nac plot'

Modules used in program:

import numpy as np
import matplotlib.pyplot as plt

python nac plot

Python matplotlib example: nac plot

'''
NAC 3-D Plot Code
'''


# import statements
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
from matplotlib import cm
from matplotlib.ticker import LinearLocator, FormatStrFormatter
import numpy as np


# 3-D axis creation
fig = plt.figure()
ax = fig.gca(projection='3d')


# Two functions for multiplication, and creating transformation matrix W
sigmoid = lambda y: 1 / (1 + np.exp(-y))
tanh = lambda x: ((np.exp(x)-np.exp(-x))/(np.exp(x)+np.exp(-x)))


# Make data
X = np.arange(-10, 10, 0.25)
Y = np.arange(-10, 10, 0.25)
X, Y = np.meshgrid(X, Y)
# Final function for Transformation Matrix W
Z = tanh(X)*sigmoid(Y)


# Axis Labelling
ax.set_xlabel('tanh(x)', fontsize=14)
ax.set_ylabel('sigmoid(y)', fontsize=14)
ax.set_zlabel('W', fontsize=14)


# Plot the surface.
surf = ax.plot_surface(X, Y, Z, cmap=cm.coolwarm,
                       linewidth=0, antialiased=False)

# Customize the z axis.
ax.set_zlim(-1.11, 1.11)
ax.zaxis.set_major_locator(LinearLocator(10))
ax.zaxis.set_major_formatter(FormatStrFormatter('%.02f'))

# Add a color bar which maps values to colors.
fig.colorbar(surf, shrink=0.5, aspect=5)
# show plot
plt.show()
# save plot in given directory
fig.savefig('NAC.png')

Python links

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Python Tutorial: https://pythonprogramminglanguage.com