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Simulink.Simulation.Futures class

Package: Simulink
Superclasses:

Create Future object for simulation

Description

Create a Simulink.Simulation.Future object when you execute parsim with the 'RunInBackground' argument set to 'on'. The parsim command runs multiple simulations in parallel using the inputs specified with an array of Simulink.SimulationInput objects. You can use this object to monitor the status of ongoing simulations, fetch outputs of completed simulations, or cancel ongoing simulations.

The parsim command uses the Parallel Computing Toolbox™ license to run the simulations in parallel. parsim runs the simulations in serial if a parallel pool cannot be created or if Parallel Computing Toolbox is not used.

Construction

future = parsim(in,'RunInBackground','on') creates a Simulink.Simulation.Future object, future, while running multiple simulations in parallel the using the inputs specified in the Simulink.SimulationInput object, in.

Input Arguments

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A Simulink.SimulationInput object or an array of Simulink.SimulationInput objects is used to run multiple simulations. Specify parameters and values of a model to run multiple simulations without making it dirty.

Example: in = Simulink.SimulationInput('vdp'), in(1:10) = Simulink.SimulationInput('vdp')

Set to 'on', to run simulations asynchronously, keeping the MATLAB® command prompt available.

Properties

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Text log of outputs from the simulation.

This property is read-only.

ID of the future object, specified as a scalar integer.

This property is read-only.

Whether a call to fetchNext or fetchOutputs has read the outputs in the Simulink.Simulation.Future object array, specified as 1 if true and 0 if false.

This property is read-only.

Current state of future object array, specified as 'pending', 'queued', 'running', 'finished','failed', or 'unavailable'.

This property is read-only.

Methods

Method

Purpose

cancel

Cancel a pending, queued, or running Simulink.Simulation.Future object

fetchNext

Fetch next available unread output from Simulink.Simulation.Future object array

fetchOutputs

Retrieve Simulink.SimulationOutput from Simulink.Simulation.Future

wait

Wait for Simulink.Simulation.Future objects to complete simulation

Examples

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This example shows how to create a Simulink.Simulation.Future object array and use it to retrieve outputs and see the status of simulations.

This example runs several simulations of the vdp model, varying the value of the gain Mu.

Open the model and define a vector of Mu values.

open_system('vdp');
Mu_Values = [0.5:0.25:5];
MuVal_length = length(Mu_Values);

Using Mu_Values, initialize an array of Simulink.SimulationInput objects. To preallocate the array, a loop index is made to start from the largest value.

for i = MuVal_length:-1:1
    in(i) = Simulink.SimulationInput('vdp');
    in(i) = in(i).setBlockParameter('vdp/Mu',...
        'Gain',num2str(Mu_Values(i)));
end

Simulate the model using parsim. Set it to 'RunInBackground', to be able to use the command prompt, while simulations are running.

Future = parsim(in,'RunInBackground','on');

Use the fetchNext method on Future simulations.

for i = 1:MuVal_length
    [completedIdx,simOut] = fetchNext(Future)
end

Introduced in R2018a