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https://github.com/tgorordo/WignerSymbols.jl.git
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9j caching to canonical lexicographical order w/ regge sym
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2 changed files with 76 additions and 46 deletions
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@ -269,19 +269,6 @@ function wigner9j(T::Type{<:Real}, j₁, j₂, j₃, j₄, j₅, j₆, j₇, j
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return _wigner9j(T, HalfInteger.((j₁, j₂, j₃, j₄, j₅, j₆, j₇, j₈, j₉))...)
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end
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const _perms9j = [([1, 2, 3], [1, 2, 3]) ([1, 2, 3], [1, 3, 2]) ([1, 2, 3], [2, 1, 3]) ([1, 2, 3], [2, 3, 1]) ([1, 2, 3], [3, 1, 2]) ([1, 2, 3], [3, 2, 1]);
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([1, 3, 2], [1, 2, 3]) ([1, 3, 2], [1, 3, 2]) ([1, 3, 2], [2, 1, 3]) ([1, 3, 2], [2, 3, 1]) ([1, 3, 2], [3, 1, 2]) ([1, 3, 2], [3, 2, 1]);
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([2, 1, 3], [1, 2, 3]) ([2, 1, 3], [1, 3, 2]) ([2, 1, 3], [2, 1, 3]) ([2, 1, 3], [2, 3, 1]) ([2, 1, 3], [3, 1, 2]) ([2, 1, 3], [3, 2, 1]);
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([2, 3, 1], [1, 2, 3]) ([2, 3, 1], [1, 3, 2]) ([2, 3, 1], [2, 1, 3]) ([2, 3, 1], [2, 3, 1]) ([2, 3, 1], [3, 1, 2]) ([2, 3, 1], [3, 2, 1]);
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([3, 1, 2], [1, 2, 3]) ([3, 1, 2], [1, 3, 2]) ([3, 1, 2], [2, 1, 3]) ([3, 1, 2], [2, 3, 1]) ([3, 1, 2], [3, 1, 2]) ([3, 1, 2], [3, 2, 1]);
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([3, 2, 1], [1, 2, 3]) ([3, 2, 1], [1, 3, 2]) ([3, 2, 1], [2, 1, 3]) ([3, 2, 1], [2, 3, 1]) ([3, 2, 1], [3, 1, 2]) ([3, 2, 1], [3, 2, 1])]
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const _signs9j = [1 -1 -1 1 1 -1;
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-1 1 1 -1 -1 1;
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-1 1 1 -1 -1 1;
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1 -1 -1 1 1 -1;
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1 -1 -1 1 1 -1;
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-1 1 1 -1 -1 1]
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function _wigner9j(T::Type{<:Real}, j₁::HalfInteger, j₂::HalfInteger, j₃::HalfInteger,
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j₄::HalfInteger, j₅::HalfInteger, j₆::HalfInteger,
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@ -292,27 +279,23 @@ function _wigner9j(T::Type{<:Real}, j₁::HalfInteger, j₂::HalfInteger, j₃::
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return zero(T)
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end
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# dictionary lookup, check all 72 permutations
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k = [j₁ j₂ j₃; j₄ j₅ j₆; j₇ j₈ j₉]
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for (p, m) in zip(_perms9j, _signs9j)
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kk = Tuple(reshape(k[p...], 9))
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kkT = Tuple(reshape(transpose(k[p...]), 9))
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if haskey(Wigner9j, kk)
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r, s = Wigner9j[kk]
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# dictionary lookup by regge symmetries
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k, m = reorder9j(j₁, j₂, j₃, j₄, j₅, j₆, j₇, j₈, j₉)
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if haskey(Wigner9j, k)
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r, s = Wigner9j[k]
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return m * _convert(T, s) * convert(T, signedroot(r))
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elseif haskey(Wigner9j, kkT)
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r, s = Wigner9j[kkT]
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return m * _convert(T, s) * convert(T, signedroot(r))
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end
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end
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# canonicalized entries
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j₁c, j₂c, j₃c, j₄c, j₅c, j₆c, j₇c, j₈c, j₉c = k
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# order irrelevant: product remains the same
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n₁, d₁ = Δ²(j₁, j₂, j₃)
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n₂, d₂ = Δ²(j₄, j₅, j₆)
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n₃, d₃ = Δ²(j₇, j₈, j₉)
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n₄, d₄ = Δ²(j₁, j₄, j₇)
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n₅, d₅ = Δ²(j₂, j₅, j₈)
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n₆, d₆ = Δ²(j₃, j₆, j₉)
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n₁, d₁ = Δ²(j₁c, j₂c, j₃c)
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n₂, d₂ = Δ²(j₄c, j₅c, j₆c)
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n₃, d₃ = Δ²(j₇c, j₈c, j₉c)
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n₄, d₄ = Δ²(j₁c, j₄c, j₇c)
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n₅, d₅ = Δ²(j₂c, j₅c, j₈c)
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n₆, d₆ = Δ²(j₃c, j₆c, j₉c)
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snum, rnum = splitsquare(n₁ * n₂ * n₃ * n₄ * n₅ * n₆)
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sden, rden = splitsquare(d₁ * d₂ * d₃ * d₄ * d₅ * d₆)
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@ -321,7 +304,7 @@ function _wigner9j(T::Type{<:Real}, j₁::HalfInteger, j₂::HalfInteger, j₃::
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rr = Base.unsafe_rational(convert(BigInt, rnum), convert(BigInt, rden))
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snum, sden = divgcd!(snum, sden)
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snum2 = compute9jseries(j₁, j₂, j₃, j₄, j₅, j₆, j₇, j₈, j₉)
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snum2 = compute9jseries(j₁c, j₂c, j₃c, j₄c, j₅c, j₆c, j₇c, j₈c, j₉c)
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for n = 1:length(sden.powers)
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p = bigprime(n)
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while sden.powers[n] > 0
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@ -336,8 +319,8 @@ function _wigner9j(T::Type{<:Real}, j₁::HalfInteger, j₂::HalfInteger, j₃::
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end
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s = Base.unsafe_rational(convert(BigInt, snum)*snum2, convert(BigInt, sden))
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Wigner9j[(j₁, j₂, j₃, j₄, j₅, j₆, j₇, j₈, j₉)] = (rr, s)
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return _convert(T, s) * convert(T, signedroot(rr))
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Wigner9j[(j₁c, j₂c, j₃c, j₄c, j₅c, j₆c, j₇c, j₈c, j₉c)] = (rr, s)
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return m * _convert(T, s) * convert(T, signedroot(rr))
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end
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# COMPUTATIONAL ROUTINES
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@ -392,6 +375,49 @@ function reorder6j(β₁, β₂, β₃, α₁, α₂, α₃, α₄)
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end
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end
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const _perms = [[1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1]]
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const _perms9j = [(r, c) for r in _perms, c in _perms]
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_permparity(p) = count(i < j && p[i] > p[j] for i in 1:length(p), j in 1:length(p)) % 2
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#const _perms9j = [([1, 2, 3], [1, 2, 3]) ([1, 2, 3], [1, 3, 2]) ([1, 2, 3], [2, 1, 3]) ([1, 2, 3], [2, 3, 1]) ([1, 2, 3], [3, 1, 2]) ([1, 2, 3], [3, 2, 1]);
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# ([1, 3, 2], [1, 2, 3]) ([1, 3, 2], [1, 3, 2]) ([1, 3, 2], [2, 1, 3]) ([1, 3, 2], [2, 3, 1]) ([1, 3, 2], [3, 1, 2]) ([1, 3, 2], [3, 2, 1]);
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# ([2, 1, 3], [1, 2, 3]) ([2, 1, 3], [1, 3, 2]) ([2, 1, 3], [2, 1, 3]) ([2, 1, 3], [2, 3, 1]) ([2, 1, 3], [3, 1, 2]) ([2, 1, 3], [3, 2, 1]);
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# ([2, 3, 1], [1, 2, 3]) ([2, 3, 1], [1, 3, 2]) ([2, 3, 1], [2, 1, 3]) ([2, 3, 1], [2, 3, 1]) ([2, 3, 1], [3, 1, 2]) ([2, 3, 1], [3, 2, 1]);
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# ([3, 1, 2], [1, 2, 3]) ([3, 1, 2], [1, 3, 2]) ([3, 1, 2], [2, 1, 3]) ([3, 1, 2], [2, 3, 1]) ([3, 1, 2], [3, 1, 2]) ([3, 1, 2], [3, 2, 1]);
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# ([3, 2, 1], [1, 2, 3]) ([3, 2, 1], [1, 3, 2]) ([3, 2, 1], [2, 1, 3]) ([3, 2, 1], [2, 3, 1]) ([3, 2, 1], [3, 1, 2]) ([3, 2, 1], [3, 2, 1])]
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# reorder parameters determining the 9j symbol to canonical (lexicographic) order with regge factor
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function reorder9j(j₁, j₂, j₃, j₄, j₅, j₆, j₇, j₈, j₉)
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J = [j₁ j₂ j₃; j₄ j₅ j₆; j₇ j₈ j₉]
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k = (j₁, j₂, j₃, j₄, j₅, j₆, j₇, j₈, j₉)
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m = 1
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rg = (-1)^sum(k)
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for p in _perms9j
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JJ = J[p...]
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kk = Tuple(reshape(JJ, 9))
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kkT = Tuple(reshape(JJ', 9))
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s = iseven(_permparity(p[1]) + _permparity(p[2])) ? 1 : rg
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if kk < kkT
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if kk < k
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k = kk
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m = s
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end
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else # kk > kkT
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if kkT < k
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k = kkT
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m = s
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end
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end
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end
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return k, m
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end
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# compute the sum appearing in the 3j symbol
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function compute3jseries(β₁, β₂, β₃, α₁, α₂)
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krange = max(α₁, α₂, zero(α₁)):min(β₁, β₂, β₃)
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@ -208,21 +208,25 @@ end
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end
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end
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@threads for i = 1:N
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@testset "wigner9j: relation to sum over 6j products, thread $i" begin
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for k = 1:10_000
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let (j1, j2, j3, j4, j5, j6, j7, j8, j9) = rand(smalljlist, 9)
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@test wigner9j(j1, j2, j3,
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j4, j5, j6,
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j7, j8, j9) ≈ sum(largejlist) do x # lazy choice for range of this sum, but good enough
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debug = false
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js = rand(smalljlist, 9)
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debug |= !(@test(wigner9j(js...) ≈ sum(largejlist) do x # lazy choice for range of this sum, but good enough
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(iseven(2x) ? (2x + 1) : -(2x + 1)) *
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wigner6j(j1, j4, j7,
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j8, j9, x ) *
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wigner6j(j2, j5, j8,
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j4, x , j6) *
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wigner6j(j3, j6, j9,
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x , j1, j2)
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end
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wigner6j(js[1], js[4], js[7],
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js[8], js[9], x ) *
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wigner6j(js[2], js[5], js[8],
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js[4], x , js[6]) *
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wigner6j(js[3], js[6], js[9],
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x , js[1], js[2])
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end) isa Test.Pass)
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if debug
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@warn "Failed on input" js
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end
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end
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end
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