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Avoid adding exact zeros #186

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Avoid adding exact zeros #186

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26 changes: 18 additions & 8 deletions src/algorithms/timestep/timeevmpo.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -103,13 +103,20 @@ function make_time_mpo(H::MPOHamiltonian, dt::Number, alg::TaylorCluster)
n1 = count(==(1), c.I)
n3 = count(==(V), c.I)

if n3 <= n1 && s_c != c
slice[linds[s_c], 1, 1, :] += slice[c_lin, 1, 1, :]
for I in nonzero_keys(slice)
(I[1] == c_lin || I[4] == c_lin) && delete!(slice, I)
if n3 <= n1 && s_c != c || n3 > n1 && s_r != c
if n3 <= n1 && s_c != c
for k in 1:size(slice, 4)
if CartesianIndex(c_lin, 1, 1, k) in nonzero_keys(slice)
slice[linds[s_c], 1, 1, k] += slice[c_lin, 1, 1, k]
end
end
elseif n3 > n1 && s_r != c
for k in 1:size(slice, 1)
if CartesianIndex(k, 1, 1, c_lin) in nonzero_keys(slice)
slice[k, 1, 1, linds[s_r]] += slice[k, 1, 1, c_lin]
end
end
end
elseif n3 > n1 && s_r != c
slice[:, 1, 1, linds[s_r]] += slice[:, 1, 1, c_lin]
for I in nonzero_keys(slice)
(I[1] == c_lin || I[4] == c_lin) && delete!(slice, I)
end
Expand All @@ -127,8 +134,11 @@ function make_time_mpo(H::MPOHamiltonian, dt::Number, alg::TaylorCluster)
b = CartesianIndex(replace(a.I, V => 1))
b_lin = linds[b]
factor = τ^n1 * factorial(N - n1) / factorial(N)
slice[:, 1, 1, b_lin] += factor * slice[:, 1, 1, a_lin]

for k in 1:size(slice, 1)
if CartesianIndex(k, 1, 1, a_lin) in nonzero_keys(slice)
slice[k, 1, 1, b_lin] += factor * slice[k, 1, 1, a_lin]
end
end
for I in nonzero_keys(slice)
(I[1] == a_lin || I[4] == a_lin) && delete!(slice, I)
end
Expand Down