I’ve been running into errors trying to use Measurements.jl combined with ModelingToolkit.jl when there’s array-valued parameters involved. Consider the following toy problem:
using ModelingToolkit, Measurements
import ModelingToolkit: t_nounits as t, D_nounits as D
function foo(; name)
@parameters a[1:1]
@variables x(t)
eqs = [
D(x) ~ a[1]
]
return System(eqs, t; name)
end
@mtkcompile sys = foo()
prob = ODEProblem(
sys,
[:a => [1.0 ± 0.1], :x => 1.0],
(0.0, 1.0)
);
which returns ERROR: TypeError: in Measurement, in T, expected T<:AbstractFloat, got Type{Real}.
From the stacktrace (included below) it seems that it’s caused by the initialization problem trying to promote the parameter to a Vector{Real}. Is it possible to prevent this promotion or the generation of an InitializationProblem altogether? The initialization of the system seems so trivial I’m not sure why one is being created in the first place. I was planning on opening an issue on this but at this point I’m not sure if it’s actually a problem with MTK or I just don’t understand system initialization.
Stacktrace
Stacktrace:
[1] promote_rule(::Type{Measurement{Float64}}, ::Type{Real})
@ Measurements C:\Users\bspanogh\.julia\packages\Measurements\pivk0\src\conversions.jl:58
[2] promote_type
@ .\promotion.jl:318 [inlined]
[3] symconvert(::Type{Real}, x::Measurement{Float64})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\systems\parameter_buffer.jl:2
[4] _broadcast_getindex_evalf
@ .\broadcast.jl:678 [inlined]
[5] _broadcast_getindex
@ .\broadcast.jl:661 [inlined]
[6] getindex
@ .\broadcast.jl:610 [inlined]
[7] copy
@ .\broadcast.jl:911 [inlined]
[8] materialize
@ .\broadcast.jl:872 [inlined]
[9] symconvert(::Type{Vector{Real}}, x::Vector{Measurement{Float64}})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\systems\parameter_buffer.jl:4
[10] MTKParameters(sys::System, op::Dict{…}; tofloat::Bool, t0::Nothing, substitution_limit::Int64, floatT::Type, p_constructor::Function, fast_path::Bool)
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\systems\parameter_buffer.jl:124
[11] process_SciMLProblem(constructor::Type, sys::System, op::Dict{…}; build_initializeprob::Bool, implicit_dae::Bool, t::Nothing, guesses::Dict{…}, warn_initialize_determined::Bool, initialization_eqs::Vector{…}, eval_expression::Bool, eval_module::Module, fully_determined::Nothing, check_initialization_units::Bool, u0_eltype::Nothing, tofloat::Bool, u0_constructor::typeof(identity), p_constructor::typeof(identity), check_length::Bool, symbolic_u0::Bool, warn_cyclic_dependency::Bool, circular_dependency_max_cycle_length::Int64, circular_dependency_max_cycles::Int64, substitution_limit::Int64, use_scc::Bool, time_dependent_init::Bool, algebraic_only::Bool, allow_incomplete::Bool, is_initializeprob::Bool, kwargs::@Kwargs{…})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\systems\problem_utils.jl:1463
[12] (NonlinearProblem{…})(sys::System, op::Dict{…}; expression::Type, check_length::Bool, check_compatibility::Bool, kwargs::@Kwargs{…})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\problems\nonlinearproblem.jl:66
[13] NonlinearProblem
@ C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\problems\nonlinearproblem.jl:57 [inlined]
[14] #_#1051
@ .\none:0 [inlined]
[15] InitializationProblem{…}(sys::System, t::Float64, op::Dict{…}; guesses::Dict{…}, check_length::Bool, warn_initialize_determined::Bool, initialization_eqs::Vector{…}, fully_determined::Nothing, check_units::Bool, use_scc::Bool, allow_incomplete::Bool, algebraic_only::Bool, time_dependent_init::Bool, kwargs::@Kwargs{…})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\problems\initializationproblem.jl:138
[16] InitializationProblem
@ C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\problems\initializationproblem.jl:20 [inlined]
[17] #_#1109
@ .\none:0 [inlined]
[18] maybe_build_initialization_problem(sys::System, iip::Bool, op::Dict{…}, t::Float64, defs::Dict{…}, guesses::Dict{…}, missing_unknowns::Set{…}; implicit_dae::Bool, time_dependent_init::Bool, u0_constructor::Function, p_constructor::Function, floatT::Type, initialization_eqs::Vector{…}, use_scc::Bool, eval_expression::Bool, eval_module::Module, kwargs::@Kwargs{…})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\systems\problem_utils.jl:1128
[19] process_SciMLProblem(constructor::Type, sys::System, op::Vector{…}; build_initializeprob::Bool, implicit_dae::Bool, t::Float64, guesses::Dict{…}, warn_initialize_determined::Bool, initialization_eqs::Vector{…}, eval_expression::Bool, eval_module::Module, fully_determined::Nothing, check_initialization_units::Bool, u0_eltype::Nothing, tofloat::Bool, u0_constructor::typeof(identity), p_constructor::typeof(identity), check_length::Bool, symbolic_u0::Bool, warn_cyclic_dependency::Bool, circular_dependency_max_cycle_length::Int64, circular_dependency_max_cycles::Int64, substitution_limit::Int64, use_scc::Bool, time_dependent_init::Bool, algebraic_only::Bool, allow_incomplete::Bool, is_initializeprob::Bool, kwargs::@Kwargs{…})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\systems\problem_utils.jl:1400
[20] (ODEProblem{…})(sys::System, op::Vector{…}, tspan::Tuple{…}; callback::Nothing, check_length::Bool, eval_expression::Bool, expression::Type, eval_module::Module, check_compatibility::Bool, kwargs::@Kwargs{})
@ ModelingToolkit C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\problems\odeproblem.jl:81
[21] ODEProblem
@ C:\Users\bspanogh\.julia\packages\ModelingToolkit\80wTI\src\problems\odeproblem.jl:73 [inlined]
[22] ODEProblem
@ .\none:0 [inlined]
[23] ODEProblem(sys::System, op::Vector{Pair{Symbol, Any}}, tspan::Tuple{Float64, Float64})
@ ModelingToolkit .\none:0
[24] top-level scope
@ c:\Users\bspanogh\Documents\Github\Caverns_of_code\Julia\MTK\issue_initialization_promotion.jl:1
Some type information was truncated. Use `show(err)` to see complete types.
Status
Status `~\Project.toml`
[eff96d63] Measurements v2.14.0
[961ee093] ModelingToolkit v10.26.0
Manifest
Status `~\Manifest.toml`
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[66dad0bd] AliasTables v1.1.3
[ec485272] ArnoldiMethod v0.4.0
⌃ [4fba245c] ArrayInterface v7.20.0
[4c555306] ArrayLayouts v1.12.0
[e2ed5e7c] Bijections v0.2.2
[62783981] BitTwiddlingConvenienceFunctions v0.1.6
[8e7c35d0] BlockArrays v1.7.2
[70df07ce] BracketingNonlinearSolve v1.5.0
[2a0fbf3d] CPUSummary v0.2.7
[49dc2e85] Calculus v0.5.2
[d360d2e6] ChainRulesCore v1.26.0
[fb6a15b2] CloseOpenIntervals v0.1.13
⌅ [861a8166] Combinatorics v1.0.2
[a80b9123] CommonMark v0.9.1
[38540f10] CommonSolve v0.2.4
[bbf7d656] CommonSubexpressions v0.3.1
[f70d9fcc] CommonWorldInvalidations v1.0.0
[34da2185] Compat v4.18.1
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⌅ [70703baa] JuliaSyntax v0.4.10
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[d236fae5] PreallocationTools v0.4.34
⌅ [aea7be01] PrecompileTools v1.2.1
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Julia version: 1.11.6