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Fix correlation_matrix issue 105 and test #106

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Fix correlation_matrix issue 105 and test #106

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2 changes: 1 addition & 1 deletion src/mps.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -896,7 +896,7 @@ function correlation_matrix(
Li21 *= oᵢ * dag(psi[pL21])'
else
sᵢ = siteind(psi, pL21)
Li21 *= prime(dag(si[pL21]), !sᵢ)
Li21 *= prime(dag(psi[pL21]), !sᵢ)
end
Li21 *= psi[pL21]
end
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3 changes: 3 additions & 0 deletions test/base/test_mps.jl
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Expand Up @@ -962,6 +962,9 @@ end
@test inner(psi', MPO(a, s), psi) ≈ Cpm[i - ss + 1, j - ss + 1]
end

# Test sites argument (also regression test for issue #105)
Cxz = correlation_matrix(psi, "X", "Z"; sites=2:2:6)

# Electron case
s = siteinds("Electron", 8)
psi = random_mps(s; linkdims=m)
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