plot_matrix_n_evectors_w_svd.py

ax = plt.gca()
ax.set_xlabel('X'); ax.set_ylabel('Y')
plt.scatter(X_raw[:, 0], X_raw[:, 1], c='#B8860B', alpha=0.5)
plt.scatter(X_mean[0], X_mean[1], c='red', s=50)
plt.axis('equal')

for length, vector in zip(e_values, V):
    dir_ = -vector * 3  * np.sqrt(length) # Tweak the sign
    start = X_mean; end = start + dir_
    arrowprops = dict(arrowstyle='->',linewidth=2, 
                      shrinkA=0, shrinkB=0, color='red', alpha=0.5)
    ax.annotate('', xy=end, xytext=start, arrowprops=arrowprops)