import numpy as np
import matplotlib.pyplot as plt

# Data to be plotted:

n = 10000  # Number of random values
x = np.random.randn(n)  # The random values
num_bins = 20  # Number of bins

# Size of figure window:

plt.figure(num=1, figsize=(24/2.54, 18/2.54))  # Inches

# Plotting the histogram:

plt.hist(x, num_bins, color='green')
plt.grid()

# plt.savefig('histogram.pdf')
plt.show()