gftool.pole_gf_z

gftool.pole_gf_z(z, poles, weights)

Green’s function given by a finite number of poles.

To be a Green’s function, np.sum(weights) has to be 1 for the 1/z tail or respectively the normalization.

Parameters:

z(…) complex array_like

Green’s function is evaluated at complex frequency z.

poles, weights(…, N) float array_like or float

The position and weight of the poles.

Returns:

(…) complex np.ndarray

Green’s function.

See also

gf_d1_z

First derivative of the Green’s function.

gf_tau

Corresponding fermionic imaginary time Green’s function.

gt.pole_gf_tau_b

Corresponding bosonic imaginary time Green’s function.