[SOLVED] IT代写 def MC_sigma_under_Q(S0, r, sigma0, rho, a, mt, T, dt):

def MC_sigma_under_Q(S0, r, sigma0, rho, a, mt, T, dt):

# Generate random Brownian Motion
P = np.array([[1, rho], [rho,1]])

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length = int(T*n_steps)
MU= np.array([0, 0])
COV = np.matrix([[1, rho], [rho, 1]])
W = np.random.multivariate_normal(MU, COV, (length, length)).T
W_S = W[0]
W_v = W[1]

# Generate paths
sigmat = np.zeros([length, length+1])
sigmat[:,0] = sigma0
St = np.zeros([length, length+1])
St[:,0] = S0

for t in range(1,length):
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