Check that independent variables are defined as @parameters

Author: hersle

src/systems/diffeqs/odesystem.jl

@@ -184,6 +184,7 @@ struct ODESystem <: AbstractODESystem
             discrete_subsystems = nothing, solved_unknowns = nothing,
             split_idxs = nothing, parent = nothing; checks::Union{Bool, Int} = true)
         if checks == true || (checks & CheckComponents) > 0
+            check_independent_variables([iv])
             check_variables(dvs, iv)
             check_parameters(ps, iv)
             check_equations(deqs, iv)

src/systems/diffeqs/sdesystem.jl

@@ -137,6 +137,7 @@ struct SDESystem <: AbstractODESystem
             complete = false, index_cache = nothing, parent = nothing;
             checks::Union{Bool, Int} = true)
         if checks == true || (checks & CheckComponents) > 0
+            check_independent_variables([iv])
             check_variables(dvs, iv)
             check_parameters(ps, iv)
             check_equations(deqs, iv)

src/systems/discrete_system/discrete_system.jl

@@ -101,6 +101,7 @@ struct DiscreteSystem <: AbstractTimeDependentSystem
             complete = false, index_cache = nothing, parent = nothing;
             checks::Union{Bool, Int} = true)
         if checks == true || (checks & CheckComponents) > 0
+            check_independent_variables([iv])
             check_variables(dvs, iv)
             check_parameters(ps, iv)
         end

src/systems/jumps/jumpsystem.jl

@@ -118,6 +118,7 @@ struct JumpSystem{U <: ArrayPartition} <: AbstractTimeDependentSystem
             complete = false, index_cache = nothing;
             checks::Union{Bool, Int} = true) where {U <: ArrayPartition}
         if checks == true || (checks & CheckComponents) > 0
+            check_independent_variables([iv])
             check_variables(unknowns, iv)
             check_parameters(ps, iv)
         end

src/utils.jl

@@ -102,6 +102,12 @@ const CheckAll = 1 << 0
 const CheckComponents = 1 << 1
 const CheckUnits = 1 << 2
 
+function check_independent_variables(ivs)
+    for iv in ivs
+        isparameter(iv) || throw(ArgumentError("Independent variable $iv is not a parameter."))
+    end
+end
+
 function check_parameters(ps, iv)
     for p in ps
         isequal(iv, p) &&