import numpy as np
import matplotlib.pyplot as plt
import scipy.linalg as la
A = np.array([[-5,-5,-1,0,0,0,500,500,100],
[0,0,0,-5,-5,-1,500,500,100],
[-150,-5,-1,0,0,0,30000,1000,80],
[0,0,0,-150,-5,-1,12000,400,80],
[-150,-150,-1,0,0,0,33000,33000,220]