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https://github.com/triqs/dft_tools
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18 lines
597 B
Python
18 lines
597 B
Python
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from inverse import inverse
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from block_gf import BlockGf
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from gf import GfImFreq
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from descriptor_base import A_Omega_Plus_B
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def delta(g) :
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"""Compute delta from G0"""
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if type(g) == BlockGf:
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return BlockGf(name_block_generator = [ (n, delta(g0)) for n,g0 in g], make_copies=False)
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elif type(g) == GfImFreq:
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g0_iw_inv = inverse(g)
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delta_iw = g0_iw_inv.copy()
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delta_iw <<= A_Omega_Plus_B(g0_iw_inv.tail[-1], g0_iw_inv.tail[0])
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delta_iw -= g0_iw_inv
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return delta_iw
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else:
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raise TypeError, "No function delta for g0 object of type %s"%type(g)
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