MATLAB: Run a Simulink model N-times and store the output of each run

monte-carlo simulationsimulink

In order to do a Monte Carlo simulation, I want to run a simulink model (containing a random generator) N-times and store the output of each run. After N runs, I want to take the RMS value of these runs and plot this result. I think I have to use a 'for' loop, but i'm not sure what the rest of the matlab code has to look like?

Best Answer

Hello,

Something like the following will do.

for i = 1:N
      sim(ModelName);
      save(['result' num2str(i)])
end

Hope it helps.

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MATLAB: Run rng Function Before Each Simulation Run

The PreSimFcn expects a SimulationInput object to be returned (in case any output is returned) and in this case 'rng' returns a struct causing the PreSimFcn to error out. You can achieve what you are looking for by defining a local function which does not return any output

numofSims=4;
simIn(1:numofSims)=Simulink.SimulationInput(model);
for i=1:numofSims
  simIn(i).PreSimFcn=@(x) seedRNG(i);
end
simOut=parsim(simIn, 'TransferBaseWorkspaceVariables', true, 'showProgress', true);
function seedRNG(seedValue)
  rng(seedValue)
end

MATLAB: Create cell array with the same string n-times

The names of your variables are a little confusing ... You are starting with values being a double array and then wanting values to be a structure ...

To answer your question you can create a cell array with the same string n-times with deal.

doc deal

Specifically you can make a 1x5 cell array filename have the value saved in name with:

[filename{1:5}] = deal(name);

you may want to consider a structure array ...

values = struct('value', mat2cell(values, 1, ones(5, 1)), 'filename', name)

Best Answer

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MATLAB: Run rng Function Before Each Simulation Run

MATLAB: Create cell array with the same string n-times

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