use sim with an ode solver, stop time, and time step

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Oliver Paleen 2023-5-26

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回答： Abhaya 2024-9-4，10:38

I want to use the sim command where I can set the ode solver, stop time, and time step so I can change these and compare the accurcary and time it takes to run each

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Answer 1

Abhaya 2024-9-4，10:38

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Hi Oliver,

To configure the solver type, stop time, and time step for your model, you can use the ‘Simulink.SimulationInput’ object. The ‘Simulink.SimulationInput’ object enables you to modify model parameters.

For more information, please refer to the following documentation of ‘Simulink.SimulationInput’ , https://www.mathworks.com/help/simulink/slref/simulink.simulationinput.html

Below is an example code that illustrates how to achieve the same,

% Load your model 
modelName = 'your_model_name'; 
load_system(modelName); 
% Create a SimulationInput object 
simIn = Simulink.SimulationInput(modelName);
% Set the solver 
simIn = simIn.setModelParameter('Solver', 'ode45'); 
% Set the fixed-step size (if using a fixed-step solver) 
simIn = simIn.setModelParameter('FixedStep', '0.01'); 
% Set start and stop times 
simIn = simIn.setModelParameter('StartTime', '0', 'StopTime', '10'); 
% Run the simulation 
simOut = sim(simIn); 
 