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  | | |_| | | | (_| |  |  Version 1.4.1
 _/ |\__'_|_|_|\__'_|  |  Ubuntu ⛬  julia/1.4.1+dfsg-1
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julia> using Modia
    PyPlot not available (plot commands will be ignored).
    Try to install PyPlot. See hints here:
    https://github.com/ModiaSim/ModiaMath.jl/wiki/Installing-PyPlot-in-a-robust-way.

julia> using ModiaMath

julia> @model FirstOrder begin
            x = Variable(start=1)   # start means x(0)
            T = Parameter(0.5)      # Time constant
            u = 2.0                 # Same as Parameter(2.0)
         @equations begin
            T*der(x) + x = u        # der() means time derivative
            end
         end;


julia> 

julia> result = simulate(FirstOrder, 2);

Simulating model: FirstOrder
Number of equations: 1
Number of variables: 2
Number of continuous states: 1
ERROR: UndefVarError: __N_VDestroy_Serial not defined
Stacktrace:
 [1] simulate!(::ModiaMath.ModiaToModiaMath.ModiaSimulationModel; tolerance::Float64, startTime::Float64, stopTime::Float64, interval::Float64, maxStepSize::Float64, maxNumberOfSteps::Missing, log::Bool, KLUorderingChoice::Int64) at /home/martin/.julia/packages/ModiaMath/xaGiR/src/SimulationEngine/simulate.jl:427
 [2] #simulate#11 at /home/martin/.julia/packages/ModiaMath/xaGiR/src/ModiaToModiaMath.jl:180 [inlined]
 [3] simulate_ida(::Modia.Instantiation.Instance, ::Array{Float64,1}, ::Nothing; log::Bool, relTol::Float64, hev::Float64, maxSparsity::Float64, store_eliminated::Bool) at /home/martin/.julia/packages/Modia/D0Mdu/src/language/Execution.jl:664
 [4] #simulate_ida#11 at /home/martin/.julia/packages/Modia/D0Mdu/src/language/Execution.jl:587 [inlined]
 [5] simulateModelWithOptions(::Modia.Instantiation.Model, ::StepRangeLen{Float64,Base.TwicePrecision{Float64},Base.TwicePrecision{Float64}}; options::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/martin/.julia/packages/Modia/D0Mdu/src/symbolic/ModelElaboration.jl:395
 [6] #simulate#9 at /home/martin/.julia/packages/Modia/D0Mdu/src/symbolic/ModelElaboration.jl:432 [inlined]
 [7] simulate(::Modia.Instantiation.Model, ::Int64) at /home/martin/.julia/packages/Modia/D0Mdu/src/symbolic/ModelElaboration.jl:425
 [8] top-level scope at REPL[4]:1
caused by [exception 1]
UndefVarError: __IDASolve not defined
Stacktrace:
 [1] simulate!(::ModiaMath.ModiaToModiaMath.ModiaSimulationModel; tolerance::Float64, startTime::Float64, stopTime::Float64, interval::Float64, maxStepSize::Float64, maxNumberOfSteps::Missing, log::Bool, KLUorderingChoice::Int64) at /home/martin/.julia/packages/ModiaMath/xaGiR/src/SimulationEngine/simulate.jl:338
 [2] #simulate#11 at /home/martin/.julia/packages/ModiaMath/xaGiR/src/ModiaToModiaMath.jl:180 [inlined]
 [3] simulate_ida(::Modia.Instantiation.Instance, ::Array{Float64,1}, ::Nothing; log::Bool, relTol::Float64, hev::Float64, maxSparsity::Float64, store_eliminated::Bool) at /home/martin/.julia/packages/Modia/D0Mdu/src/language/Execution.jl:664
 [4] #simulate_ida#11 at /home/martin/.julia/packages/Modia/D0Mdu/src/language/Execution.jl:587 [inlined]
 [5] simulateModelWithOptions(::Modia.Instantiation.Model, ::StepRangeLen{Float64,Base.TwicePrecision{Float64},Base.TwicePrecision{Float64}}; options::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/martin/.julia/packages/Modia/D0Mdu/src/symbolic/ModelElaboration.jl:395
 [6] #simulate#9 at /home/martin/.julia/packages/Modia/D0Mdu/src/symbolic/ModelElaboration.jl:432 [inlined]
 [7] simulate(::Modia.Instantiation.Model, ::Int64) at /home/martin/.julia/packages/Modia/D0Mdu/src/symbolic/ModelElaboration.jl:425
 [8] top-level scope at REPL[4]:1

julia>