Moment of \(y_n\) with order \(l\)
l (int) – order of the moment.
poly with attribute keyfor = (‘(n_1m*k1+n_2m*k2)^{-i_m},…,(n_11*k1+n_21*k2)^{-i_1}’, ‘e^{-(n1*k1+n2*k2)h}’,’h’,’mu’, ‘theta1’,’sigma_v1’,’theta2’,’sigma_v2’, ‘lambda’,’mu_j’,’sigma_j’).
keyfor
Poly