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Merged
merged 1 commit into from
Feb 24, 2021
Merged

add isautonomous #810

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2 changes: 1 addition & 1 deletion Project.toml
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
name = "ModelingToolkit"
uuid = "961ee093-0014-501f-94e3-6117800e7a78"
authors = ["Chris Rackauckas <accounts@chrisrackauckas.com>"]
version = "5.6.4"
version = "5.7.0"

[deps]
ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"
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7 changes: 6 additions & 1 deletion src/systems/diffeqs/abstractodesystem.jl
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Expand Up @@ -99,6 +99,11 @@ jacobian_sparsity(sys::AbstractODESystem) =
jacobian_sparsity([eq.rhs for eq ∈ equations(sys)],
[dv for dv in states(sys)])

function isautonomous(sys::AbstractODESystem)
tgrad = calculate_tgrad(sys;simplify=true)
all(iszero,tgrad)
end

function DiffEqBase.ODEFunction(sys::AbstractODESystem, args...; kwargs...)
ODEFunction{true}(sys, args...; kwargs...)
end
Expand Down Expand Up @@ -198,7 +203,7 @@ function ODEFunctionExpr{iip}(sys::AbstractODESystem, dvs = states(sys),
$fsym(u,p,t) = $f_oop(u,p,t)
$fsym(du,u,p,t) = $f_iip(du,u,p,t)
end

tgradsym = gensym(:tgrad)
if tgrad
tgrad_oop, tgrad_iip = generate_tgrad(sys, dvs, ps;
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1 change: 1 addition & 0 deletions test/odesystem.jl
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Expand Up @@ -243,6 +243,7 @@ sys = ODESystem(eqs)
@test all(isequal.(states(sys), [x, y, z]))
@test all(isequal.(parameters(sys), [σ, β]))
@test equations(sys) == eqs
@test ModelingToolkit.isautonomous(sys)

# issue 701
using ModelingToolkit
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