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[v9] fix: retain events and metadata in substitute #3770

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Merged
merged 1 commit into from
Jul 4, 2025
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[v9] fix: retain events and metadata in substitute #3770

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19 changes: 12 additions & 7 deletions src/systems/abstractsystem.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2835,15 +2835,20 @@ function Symbolics.substitute(sys::AbstractSystem, rules::Union{Vector{<:Pair},
elseif sys isa ODESystem
rules = todict(map(r -> Symbolics.unwrap(r[1]) => Symbolics.unwrap(r[2]),
collect(rules)))
eqs = fast_substitute(get_eqs(sys), rules)
pdeps = fast_substitute(get_parameter_dependencies(sys), rules)
defs = Dict(fast_substitute(k, rules) => fast_substitute(v, rules)
newsys = @set sys.eqs = fast_substitute(get_eqs(sys), rules)
@set! newsys.unknowns = map(get_unknowns(sys)) do var
get(rules, var, var)
end
@set! newsys.ps = map(get_ps(sys)) do var
get(rules, var, var)
end
@set! newsys.parameter_dependencies = fast_substitute(
get_parameter_dependencies(sys), rules)
@set! newsys.defaults = Dict(fast_substitute(k, rules) => fast_substitute(v, rules)
for (k, v) in get_defaults(sys))
guess = Dict(fast_substitute(k, rules) => fast_substitute(v, rules)
@set! newsys.guesses = Dict(fast_substitute(k, rules) => fast_substitute(v, rules)
for (k, v) in get_guesses(sys))
subsys = map(s -> substitute(s, rules), get_systems(sys))
ODESystem(eqs, get_iv(sys); name = nameof(sys), defaults = defs,
guesses = guess, parameter_dependencies = pdeps, systems = subsys)
@set! newsys.systems = map(s -> substitute(s, rules), get_systems(sys))
else
error("substituting symbols is not supported for $(typeof(sys))")
end
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23 changes: 23 additions & 0 deletions test/odesystem.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1783,3 +1783,26 @@ end
@test !process_running(proc)
kill(proc, Base.SIGKILL)
end

@testset "`substitute` retains events and metadata" begin
@parameters p(t) = 1.0
@variables x(t) = 0.0
event = [0.5] => [p ~ t]
event2 = [x ~ 0.75] => [p ~ 2 * t]

eq = [
D(x) ~ p
]
@named sys = ODESystem(eq, t, [x], [p], discrete_events = [event],
continuous_events = [event2], metadata = "TEST")

@variables x2(t) = 0.0
sys2 = substitute(sys, [x => x2])

@test length(ModelingToolkit.get_discrete_events(sys)) == 1
@test length(ModelingToolkit.get_discrete_events(sys2)) == 1
@test length(ModelingToolkit.get_continuous_events(sys)) == 1
@test length(ModelingToolkit.get_continuous_events(sys2)) == 1
@test ModelingToolkit.get_metadata(sys) == "TEST"
@test ModelingToolkit.get_metadata(sys2) == "TEST"
end
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