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Block Compiled Sample Time

During the compilation phase of a simulation, Simulink® determines the sample time of a block from the SampleTime parameter (if the block has an explicit sample time), the block type (if it has an implicit sample time), or by the model content. This compiled sample time determines the sample rate of a block during simulation. You can determine the compiled sample time of any block in a model by first updating the model and then getting the block CompiledSampleTime parameter, using the get_param command.

For example, consider the model ex_compiled_sample_new.

Use get_param to obtain the block CompiledSampleTime parameter for each of the blocks in this example.

get_param('model_name/block_name','CompiledSampleTime');
For the Sine Wave3 block,
get_param('ex_compiled_sample_new/Sine Wave3','CompiledSampleTime');
displays
0.5000   0
The atomic subsystem contains sine wave blocks with sample times of 3 and 4.

When calculating the block CompiledSampleTime for this subsystem, Simulink returns a cell array of the sample times present in the subsystem.

3   0
4   0
The greatest common divisor (GCD) of the two rates is 1. However, this is not necessarily one of the rates in the model.

The Rate Transition block in this model serves as a Zero-Order Hold. Since the Sample Time Multiple parameter is set to 3, the input to the rate transition block has a sample rate of 0.5 while the output has a rate of 1.5.

rt=get_param('ex_compiled_sample_new/Rate Transition',...
'CompiledSampleTime');
rt{:}

0.5000   0
1.5000   0

The Sample Time Legend shows all of the sample rates present in the model.

To inspect compiled sample times throughout a model, you can use the Model Data Editor (View > Model Data). After you update the block diagram, the right side of the Sample Time column shows compiled sample times for signals and data stores. For more information about the Model Data Editor, see Configure Data Properties by Using the Model Data Editor.

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