Help with exporting variables from function to workspace to then run in simulink file

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Simeon
Simeon 2025-12-3，14:59
回答： Paul 2025-12-3，21:30
I have a function where I assign values to variables and then open a simulation and run it using those variables. I am using a function so that I can pick and choose which simulations I am running but although the simulations are within the function it doesn't recognise that they are there. Attached code below:
function IGBT_MOSFET = Sim_IGBT(n)
if n == 'On'
Vth_MOSFET = 3.8;
Vth_IGBT = 6.2;
Vf = 1.8;
R_on_MOSFET = 18e-3;
R_on_IGBT = 72.5;
E_on_MOSFET = 1100e-6;
E_off_MOSFET = 180e-6;
V_off_MOSFET = 800;
I_on_MOSFET = 42;
E_on_IGBT = 2.7e-3;
E_off_IGBT = 1.1e-3;
V_off_IGBT = 600;
I_on_IGBT = 40;
% open('Coursework_part_4_sim_IGBT.slx')
% open('Coursework_part_4_sim_MOSFET.slx')
% sim('Coursework_part_4_sim_IGBT.slx')
% sim('Coursework_part_4_sim_MOSFET.slx')
else
end
end

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回答（2 个）

Paul
Paul 2025-12-3，21:30
The "modern" way to do this with the sim command is to use a Simulink.SimulationInput as the input. See that doc page to get started, particularly the link to setVariable. Also, use the output argument form of sim.
Fangjun Jiang
Fangjun Jiang 2025-12-3，15:23
编辑：Fangjun Jiang 2025-12-3，15:24
You will need to use assignin('base','Vth_MOSFET',3.8) etc. to make this work.
Your current code assigns the variables and their values in the function workspace, while your Simulink model most likely uses the variables in the base workspace.
It will be inconvenient to have so many assignin() statements. The other way is to save these variables in a .m file and run evalin('base','Mfile')

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