Merge pull request SciML#3764 from oameye/complex

fix: enable support for complex ODEProblem again

Author: ChrisRackauckas

src/systems/index_cache.jl

@@ -388,8 +388,8 @@ function IndexCache(sys::AbstractSystem)
         observed_syms_to_timeseries,
         dependent_pars_to_timeseries,
         disc_buffer_templates,
-        BufferTemplate(Real, tunable_buffer_size),
-        BufferTemplate(Real, initials_buffer_size),
+        BufferTemplate(Number, tunable_buffer_size),
+        BufferTemplate(Number, initials_buffer_size),
         const_buffer_sizes,
         nonnumeric_buffer_sizes,
         symbol_to_variable

src/systems/problem_utils.jl

@@ -1185,7 +1185,7 @@ function float_type_from_varmap(varmap, floatT = Bool)
 
         if v isa AbstractArray
             floatT = promote_type(floatT, eltype(v))
-        elseif v isa Real
+        elseif v isa Number
             floatT = promote_type(floatT, typeof(v))
         end
     end

test/complex.jl

@@ -14,3 +14,31 @@ using Test
 end
 @named mixed = ComplexModel()
 @test length(equations(mixed)) == 2
+
+@testset "Complex ODEProblem" begin
+    using ModelingToolkit: t_nounits as t, D_nounits as D
+
+    vars = @variables x(t) y(t) z(t)
+    pars = @parameters a b
+
+    eqs = [
+        D(x) ~ y - x,
+        D(y) ~ -x * z + b * abs(z),
+        D(z) ~ x * y - a
+    ]
+    @named modlorenz = System(eqs, t)
+    sys = mtkcompile(modlorenz)
+
+    ic = ModelingToolkit.get_index_cache(sys)
+    @test ic.tunable_buffer_size.type == Number
+
+    u0 = ComplexF64[-4.0, 5.0, 0.0] .+ randn(ComplexF64, 3)
+    p = ComplexF64[5.0, 0.1]
+    dict = merge(Dict(unknowns(sys) .=> u0), Dict(parameters(sys) .=> p))
+    prob = ODEProblem(sys, dict, (0.0, 1.0))
+
+    using OrdinaryDiffEq
+    sol = solve(prob, Tsit5(), saveat = 0.1)
+
+    @test sol.u[1] isa Vector{ComplexF64}
+end