Modify Graded{<:Abelian}(::Spin) so that it matches the bases of `m…

…atrix(::SpinIndex)`.
Quantum-Many-Body · Dec 27, 2024 · 7b83462 · 7b83462
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commit 7b83462
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diff --git a/src/QuantumSystems.jl b/src/QuantumSystems.jl
@@ -739,7 +739,7 @@ Decompose a local spin space into an Abelian graded space that preserves 1, 2) n
 @inline Graded{ℤ₁}(spin::Spin) = Graded{ℤ₁}(0=>Int(2*totalspin(spin)+1))
 function Graded{𝕊ᶻ}(spin::Spin)
     S = totalspin(spin)
-    return Graded{𝕊ᶻ}(sz=>1 for sz in -S:1:S)
+    return Graded{𝕊ᶻ}(sz=>1 for sz in -S:1:S)'
 end
 
 ## Permutation

diff --git a/test/QuantumSystems.jl b/test/QuantumSystems.jl
@@ -464,7 +464,7 @@ end
 @testset "Grad Spin" begin
     spin = Spin{3//2}()
     @test Graded(spin) == Graded{ℤ₁}(spin) == Graded{ℤ₁}(0=>4)
-    @test Graded{𝕊ᶻ}(spin) == Graded{𝕊ᶻ}(-3//2=>1, -1//2=>1, 1//2=>1, 3//2=>1)
+    @test Graded{𝕊ᶻ}(spin) == Graded{𝕊ᶻ}(-3//2=>1, -1//2=>1, 1//2=>1, 3//2=>1)'
 end
 
 @testset "Spin operator" begin