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add direct G_iw measurement #168

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add a new measurement to measure the single particle Matsubara Green function G_iw for a specific amount of frequencies. The following solve parameters have been added:

p["measure_G_iw"] = True
p["measure_G_n_iw"] = 10

see test/python/single_site_bethe.py for usage. The measured G_iw is stored in self.G_iw_direct.

@the-hampel the-hampel force-pushed the dev_G_iw_measure branch 4 times, most recently from 77a9a00 to 21da880 Compare June 30, 2023 13:02
@the-hampel the-hampel requested a review from Wentzell June 30, 2023 13:04
@the-hampel the-hampel force-pushed the dev_G_iw_measure branch 2 times, most recently from afd4700 to 4ee17fd Compare July 10, 2023 15:56
@the-hampel
[feat] measure G_iw_direct test, cleanup, expose
39a14ce 
* fix indices in direct measurement of G_iw
* fill negative frequencies with conj(G_iw)
* cleanup
* integrate into single site bethe test the new measurement and check
  against Fourier trafo of G(tau)
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@Wentzell Wentzell Awaiting requested review from Wentzell

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@the-hampel @parcollet @Wentzell