Make NullParameters as default for params

Author: albertomercurio

src/QuantumToolbox.jl

@@ -23,6 +23,7 @@ import SciMLBase:
     reinit!,
     remake,
     u_modified!,
+    NullParameters,
     ODEFunction,
     ODEProblem,
     SDEProblem,

src/time_evolution/mcsolve.jl

@@ -104,7 +104,7 @@ end
         tlist::AbstractVector,
         c_ops::Union{Nothing,AbstractVector,Tuple} = nothing;
         e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-        params = eltype(ψ0)[],
+        params = NullParameters(),
         rng::AbstractRNG = default_rng(),
         jump_callback::TJC = ContinuousLindbladJumpCallback(),
         kwargs...,
@@ -151,7 +151,7 @@ If the environmental measurements register a quantum jump, the wave function und
 - `tlist`: List of times at which to save either the state or the expectation values of the system.
 - `c_ops`: List of collapse operators ``\{\hat{C}_n\}_n``. It can be either a `Vector` or a `Tuple`.
 - `e_ops`: List of operators for which to calculate expectation values. It can be either a `Vector` or a `Tuple`.
-- `params`: `NamedTuple` or `AbstractVector` of parameters to pass to the solver. For more advanced usage, any custom struct can be used.
+- `params`: Parameters to pass to the solver. This argument is usually expressed as a `NamedTuple` or `AbstractVector` of parameters. For more advanced usage, any custom struct can be used.
 - `rng`: Random number generator for reproducibility.
 - `jump_callback`: The Jump Callback type: Discrete or Continuous. The default is `ContinuousLindbladJumpCallback()`, which is more precise.
 - `kwargs`: The keyword arguments for the ODEProblem.
@@ -173,7 +173,7 @@ function mcsolveProblem(
     tlist::AbstractVector,
     c_ops::Union{Nothing,AbstractVector,Tuple} = nothing;
     e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-    params = eltype(ψ0)[],
+    params = NullParameters(),
     rng::AbstractRNG = default_rng(),
     jump_callback::TJC = ContinuousLindbladJumpCallback(),
     kwargs...,
@@ -231,7 +231,7 @@ end
         tlist::AbstractVector,
         c_ops::Union{Nothing,AbstractVector,Tuple} = nothing;
         e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-        params::Union{NamedTuple,AbstractVector} = eltype(ψ0)[],
+        params = NullParameters(),
         rng::AbstractRNG = default_rng(),
         ntraj::Int = 1,
         ensemble_method = EnsembleThreads(),
@@ -283,7 +283,7 @@ If the environmental measurements register a quantum jump, the wave function und
 - `tlist`: List of times at which to save either the state or the expectation values of the system.
 - `c_ops`: List of collapse operators ``\{\hat{C}_n\}_n``. It can be either a `Vector` or a `Tuple`.
 - `e_ops`: List of operators for which to calculate expectation values. It can be either a `Vector` or a `Tuple`.
-- `params`: `NamedTuple` or `AbstractVector` of parameters to pass to the solver.
+- `params`: Parameters to pass to the solver. This argument is usually expressed as a `NamedTuple` or `AbstractVector` of parameters. For more advanced usage, any custom struct can be used.
 - `rng`: Random number generator for reproducibility.
 - `ntraj`: Number of trajectories to use.
 - `ensemble_method`: Ensemble method to use. Default to `EnsembleThreads()`.
@@ -310,7 +310,7 @@ function mcsolveEnsembleProblem(
     tlist::AbstractVector,
     c_ops::Union{Nothing,AbstractVector,Tuple} = nothing;
     e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-    params::Union{NamedTuple,AbstractVector} = eltype(ψ0)[],
+    params = NullParameters(),
     rng::AbstractRNG = default_rng(),
     ntraj::Int = 1,
     ensemble_method = EnsembleThreads(),
@@ -354,7 +354,7 @@ end
         c_ops::Union{Nothing,AbstractVector,Tuple} = nothing;
         alg::OrdinaryDiffEqAlgorithm = Tsit5(),
         e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-        params::Union{NamedTuple,AbstractVector} = eltype(ψ0)[],
+        params = NullParameters(),
         rng::AbstractRNG = default_rng(),
         ntraj::Int = 1,
         ensemble_method = EnsembleThreads(),
@@ -408,7 +408,7 @@ If the environmental measurements register a quantum jump, the wave function und
 - `c_ops`: List of collapse operators ``\{\hat{C}_n\}_n``. It can be either a `Vector` or a `Tuple`.
 - `alg`: The algorithm to use for the ODE solver. Default to `Tsit5()`.
 - `e_ops`: List of operators for which to calculate expectation values. It can be either a `Vector` or a `Tuple`.
-- `params`: `NamedTuple` or `AbstractVector` of parameters to pass to the solver.
+- `params`: Parameters to pass to the solver. This argument is usually expressed as a `NamedTuple` or `AbstractVector` of parameters. For more advanced usage, any custom struct can be used.
 - `rng`: Random number generator for reproducibility.
 - `ntraj`: Number of trajectories to use.
 - `ensemble_method`: Ensemble method to use. Default to `EnsembleThreads()`.
@@ -439,7 +439,7 @@ function mcsolve(
     c_ops::Union{Nothing,AbstractVector,Tuple} = nothing;
     alg::OrdinaryDiffEqAlgorithm = Tsit5(),
     e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-    params::Union{NamedTuple,AbstractVector} = eltype(ψ0)[],
+    params = NullParameters(),
     rng::AbstractRNG = default_rng(),
     ntraj::Int = 1,
     ensemble_method = EnsembleThreads(),

src/time_evolution/sesolve.jl

@@ -25,7 +25,7 @@ _sesolve_make_U_QobjEvo(H) = QobjEvo(H, -1im)
         ψ0::QuantumObject{DT2,KetQuantumObject},
         tlist::AbstractVector;
         e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-        params = eltype(ψ0)[],
+        params = NullParameters(),
         progress_bar::Union{Val,Bool} = Val(true),
         inplace::Union{Val,Bool} = Val(true),
         kwargs...,
@@ -43,7 +43,7 @@ Generate the ODEProblem for the Schrödinger time evolution of a quantum system:
 - `ψ0`: Initial state of the system ``|\psi(0)\rangle``.
 - `tlist`: List of times at which to save either the state or the expectation values of the system.
 - `e_ops`: List of operators for which to calculate expectation values. It can be either a `Vector` or a `Tuple`.
-- `params`: `NamedTuple` or `AbstractVector` of parameters to pass to the solver. For more advanced usage, any custom struct can be used.
+- `params`: Parameters to pass to the solver. This argument is usually expressed as a `NamedTuple` or `AbstractVector` of parameters. For more advanced usage, any custom struct can be used.
 - `progress_bar`: Whether to show the progress bar. Using non-`Val` types might lead to type instabilities.
 - `inplace`: Whether to use the inplace version of the ODEProblem. The default is `Val(true)`.
 - `kwargs`: The keyword arguments for the ODEProblem.
@@ -64,7 +64,7 @@ function sesolveProblem(
     ψ0::QuantumObject{DT2,KetQuantumObject},
     tlist::AbstractVector;
     e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-    params = eltype(ψ0)[],
+    params = NullParameters(),
     progress_bar::Union{Val,Bool} = Val(true),
     inplace::Union{Val,Bool} = Val(true),
     kwargs...,
@@ -102,7 +102,7 @@ end
         tlist::AbstractVector;
         alg::OrdinaryDiffEqAlgorithm = Tsit5(),
         e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-        params = eltype(ψ0)[],
+        params = NullParameters(),
         progress_bar::Union{Val,Bool} = Val(true),
         inplace::Union{Val,Bool} = Val(true),
         kwargs...,
@@ -121,7 +121,7 @@ Time evolution of a closed quantum system using the Schrödinger equation:
 - `tlist`: List of times at which to save either the state or the expectation values of the system.
 - `alg`: The algorithm for the ODE solver. The default is `Tsit5()`.
 - `e_ops`: List of operators for which to calculate expectation values. It can be either a `Vector` or a `Tuple`.
-- `params`: `NamedTuple` or `AbstractVector` of parameters to pass to the solver. For more advanced usage, any custom struct can be used.
+- `params`: Parameters to pass to the solver. This argument is usually expressed as a `NamedTuple` or `AbstractVector` of parameters. For more advanced usage, any custom struct can be used.
 - `progress_bar`: Whether to show the progress bar. Using non-`Val` types might lead to type instabilities.
 - `inplace`: Whether to use the inplace version of the ODEProblem. The default is `Val(true)`.
 - `kwargs`: The keyword arguments for the ODEProblem.
@@ -144,7 +144,7 @@ function sesolve(
     tlist::AbstractVector;
     alg::OrdinaryDiffEqAlgorithm = Tsit5(),
     e_ops::Union{Nothing,AbstractVector,Tuple} = nothing,
-    params = eltype(ψ0)[],
+    params = NullParameters(),
     progress_bar::Union{Val,Bool} = Val(true),
     inplace::Union{Val,Bool} = Val(true),
     kwargs...,

src/time_evolution/time_evo_parameters.jl

@@ -48,6 +48,7 @@ function _vectorize_params(p::TimeEvolutionParameters{ParT}) where {ParT<:NamedT
     buffer = isempty(p.params) ? ComplexF64[] : collect(values(p.params))
     return (buffer, false)
 end
+_vectorize_params(p::TimeEvolutionParameters{ParT}) where {ParT<:NullParameters} = (ComplexF64[], false)
 _vectorize_params(p::TimeEvolutionParameters{ParT}) where {ParT<:AbstractVector} = (p.params, true)
 
 function canonicalize(::Tunable, p::TimeEvolutionParameters)