Why Interact Programmatically?

You can build an accelerated model, select the simulation mode, and run the simulation programmatically. With this flexibility, you can create accelerator mode MEX-files in batch mode, allowing you to build the C code and executable before running the simulations. When you use accelerator mode interactively at a later time, it will not be necessary to generate or compile MEX-files at the start of the accelerated simulations.

Build JIT Accelerated Execution Engine

With the accelbuild command, you can build a JIT accelerated execution engine without actually simulating the model. For example, to build an accelerator mode simulation of myModel:

accelbuild myModel

Control Simulation

You can control the simulation mode programmatically using the set_param command:

set_param('modelname','SimulationMode','mode')

The simulation mode can be normal, accelerator, rapid, or external.

For example, to simulate your model using accelerator mode, you would use:

set_param('myModel','SimulationMode','accelerator')

simOut = sim('myModel','SimulationMode','accelerator');

You can use bdroot to set parameters for the currently active model (that is, the active model window) rather than modelname if you do not wish to explicitly specify the model name.

For example, to simulate the currently opened system using rapid accelerator mode, you would use:

simOut = sim(bdroot,'SimulationMode','rapid');

Simulate Your Model

You can use set_param to configure the model parameters (such as the simulation mode and the stop time), and use the sim command to start the simulation:

sim('modelname','ReturnWorkspaceOutputs','on');

However, the preferred method is to configure model parameters directly using the sim command, as shown in the previous section.

You can substitute gcs for modelname if you do not want to explicitly specify the model name.

Unless target code has already been generated, the sim function first builds the executable and then runs the simulation. However, if the target code has already been generated and no significant changes have been made to the model (see Code Regeneration in Accelerated Models for a description), the sim function executes the generated code without regenerating the code. This process lets you run your model after making simple changes without having to wait for the model to rebuild.

simOut = sim('myModel','SimulationMode','rapid', ...
'StopTime','10000');

Customize the Acceleration Build Process

You can programmatically control the accelerator mode and rapid accelerator mode build process and the amount of information displayed during the build process. See Customize the Build Process for details on why doing so might be advantageous.

set_param('myModel','SimCompilerOptimization','on')

set_param('myModel','AccelVerboseBuild','on')