Create a model with interval parameters #3372
Description
Describe the bug 🐞
In a fresh Julia REPL I can setup a model using @mtkmodel and have some of the parameters as intervals (from IntervalArithmetics.jl). However if I then run the code again and change it to a normal (non-interval) parameter i get a TypeError. However, if I start another fresh REPL and run the code witha normal parameter, it works. And by changing it to an interval, it doesn't work. So depending in what order I run it, they both work. In my case it happens for the parameters, R, L, k, J, f but not the other two.
Expected behavior
Since both of them work with a fresh Julia REPL I would expect them to work if I simply change the parameter. The order should not matter.
Minimal Reproducible Example 👇
I tried to create a smaller example but then it worked for some reason. This is an example in the ModelingToolkitStandardLibrary documentation.
using ModelingToolkit
using ModelingToolkit: t_nounits as t
using IntervalArithmetic
using ModelingToolkitStandardLibrary.Electrical
using ModelingToolkitStandardLibrary.Blocks
using ModelingToolkitStandardLibrary.Mechanical.Rotational
@mtkmodel DCMotor begin
@parameters begin
R = 0.5# first run this and then add ±0.1 and run again to get the error,(or the other way around) [description = "Armature resistance"] # Ohm
L = 4.5e-3, [description = "Armature inductance"] # H
k = 0.5±0.01, [description = "Motor constant"] # N.m/A
J = 0.02, [description = "Inertia"] # kg.m²
f = 0.01, [description = "Friction factor"] # N.m.s/rad
tau_L_step = -0.3, [description = "Amplitude of the load torque step"] # N.m
u_max=1
end
@components begin
ground = Ground()
source = Voltage()
ref = Blocks.Step(height = 1, start_time = 0)
pi_controller = Blocks.LimPI(k = 1.1, T = 0.035, u_max = u_max, Ta = 0.035)
feedback = Blocks.Feedback()
R1 = Resistor(R = R)
L1 = Inductor(L = L,i=0)
emf = EMF(k = k)
fixed = Fixed()
load = Torque()
load_step = Blocks.Step(height = tau_L_step, start_time = 3)
inertia = Inertia(J = J, phi = 0.0, w = 0.0)
friction = Damper(d = f)
speed_sensor = SpeedSensor()
end
@equations begin
connect(fixed.flange, emf.support, friction.flange_b)
connect(emf.flange, friction.flange_a, inertia.flange_a)
connect(inertia.flange_b, load.flange)
connect(inertia.flange_b, speed_sensor.flange)
connect(load_step.output, load.tau)
connect(ref.output, feedback.input1)
connect(speed_sensor.w, :y, feedback.input2)
connect(feedback.output, pi_controller.err_input)
connect(pi_controller.ctr_output, :u, source.V)
connect(source.p, R1.p)
connect(R1.n, L1.p)
connect(L1.n, emf.p)
connect(emf.n, source.n, ground.g)
end
end
@named model = DCMotor()Error & Stacktrace
ERROR: LoadError: TypeError: non-boolean (Interval{Float64}) used in boolean context
Stacktrace:
[1] signequal(x::Float64, y::Interval{Float64})
@ Base ./operators.jl:136
[2] isequal(x::Float64, y::Interval{Float64})
@ Base ./operators.jl:141
[3] isequal_with_metadata(a::Float64, b::Interval{Float64})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:365
[4] isequal_with_metadata(a::Base.ImmutableDict{DataType, Any}, b::Base.ImmutableDict{DataType, Any})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:346
[5] isequal_with_metadata(a::SymbolicUtils.BasicSymbolic{Real}, b::SymbolicUtils.BasicSymbolic{Real})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:303
[6] isequal_with_metadata(a::Base.ImmutableDict{DataType, Any}, b::Base.ImmutableDict{DataType, Any})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:346
[7] isequal_with_metadata(a::SymbolicUtils.BasicSymbolic{Real}, b::SymbolicUtils.BasicSymbolic{Real})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:303
[8] SymbolicUtils.BasicSymbolic(s::SymbolicUtils.BasicSymbolic{Real})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:516
[9] #_#15
@ ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:525 [inlined]
[10] setproperties(obj::SymbolicUtils.BasicSymbolic{Real}, patch::@NamedTuple{metadata::Base.ImmutableDict{DataType, Any}})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:100
[11] set
@ ~/.julia/packages/Setfield/PdKfV/src/lens.jl:122 [inlined]
[12] macro expansion
@ ~/.julia/packages/Setfield/PdKfV/src/sugar.jl:197 [inlined]
[13] setmetadata(s::SymbolicUtils.BasicSymbolic{Real}, ctx::DataType, val::SymbolicUtils.BasicSymbolic{Real})
@ SymbolicUtils ~/.julia/packages/SymbolicUtils/2cE5G/src/types.jl:902
[14] set_scalar_metadata
@ ~/.julia/packages/Symbolics/rjrbr/src/variable.jl:43 [inlined]
[15] setdefaultval(x::SymbolicUtils.BasicSymbolic{Real}, val::SymbolicUtils.BasicSymbolic{Real})
@ Symbolics ~/.julia/packages/Symbolics/rjrbr/src/variable.jl:45
[16] setdefault(v::Num, val::Num)
@ ModelingToolkit ~/.julia/packages/ModelingToolkit/41wGH/src/utils.jl:244
[17] __Resistor__(; name::Symbol, R::Num)
@ ModelingToolkitStandardLibrary.Electrical ~/.julia/packages/ModelingToolkit/41wGH/src/systems/model_parsing.jl:914
[18] __Resistor__
@ ~/.julia/packages/ModelingToolkit/41wGH/src/systems/model_parsing.jl:138 [inlined]
[19] #_#449
@ ~/.julia/packages/ModelingToolkit/41wGH/src/systems/model_parsing.jl:25 [inlined]
[20] macro expansion
@ ~/.julia/packages/ModelingToolkit/41wGH/src/systems/abstractsystem.jl:2081 [inlined]
[21]
@ Main ~/.julia/packages/ModelingToolkit/41wGH/src/systems/model_parsing.jl:914
[22] __DCMotor__
@ ~/.julia/packages/ModelingToolkit/41wGH/src/systems/model_parsing.jl:138 [inlined]
[23] #_#449
@ ~/.julia/packages/ModelingToolkit/41wGH/src/systems/model_parsing.jl:25 [inlined]
[24] top-level scope
@ ~/.julia/packages/ModelingToolkit/41wGH/src/systems/abstractsystem.jl:2081
in expression starting at /home/rasmus/Exjobb/julia_testing_environment/mwe.jl:51
Some type information was truncated. Use `show(err)` to see complete types.Environment (please complete the following information):
- Output of
using Pkg; Pkg.status()
Status `/tmp/jl_gcMq8z/Project.toml`
[d1acc4aa] IntervalArithmetic v0.22.22
[961ee093] ModelingToolkit v9.62.0
[16a59e39] ModelingToolkitStandardLibrary v2.19.0- Output of
using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)
Status `/tmp/jl_gcMq8z/Manifest.toml`
[47edcb42] ADTypes v1.12.1
[1520ce14] AbstractTrees v0.4.5
[7d9f7c33] Accessors v0.1.41
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[66dad0bd] AliasTables v1.1.3
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[2a0fbf3d] CPUSummary v0.2.6
[00ebfdb7] CSTParser v3.4.3
[d360d2e6] ChainRulesCore v1.25.1
[fb6a15b2] CloseOpenIntervals v0.1.13
[861a8166] Combinatorics v1.0.2
[a80b9123] CommonMark v0.8.15
[38540f10] CommonSolve v0.2.4
[bbf7d656] CommonSubexpressions v0.3.1
[f70d9fcc] CommonWorldInvalidations v1.0.0
[34da2185] Compat v4.16.0
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[d25df0c9] Inflate v0.1.5
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[3587e190] InverseFunctions v0.1.17
[92d709cd] IrrationalConstants v0.2.4
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[e1d29d7a] Missings v1.2.0
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[3f19e933] p7zip_jll v17.4.0+2
Info Packages marked with ⌅ have new versions available but compatibility constraints restrict them from upgrading. To see why use `status --outdated -m`- Output of
versioninfo()
Julia Version 1.11.3
Commit d63adeda50d (2025-01-21 19:42 UTC)
Build Info:
Official https://julialang.org/ release
Platform Info:
OS: Linux (x86_64-linux-gnu)
CPU: 8 × 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
WORD_SIZE: 64
LLVM: libLLVM-16.0.6 (ORCJIT, tigerlake)
Threads: 1 default, 0 interactive, 1 GC (on 8 virtual cores)
Environment:
JULIA_EDITOR = code
JULIA_NUM_THREADS =
Additional context