Documentation

Types of Sample Time for MATLAB System Block

If you use discrete sample time in simulation, Simulink^® only calculates the output of a simulation for each of the fixed time intervals. To specify discrete sample time, in the createSampleTime, set 'Type' to 'Discrete' and set the 'SampleTime' property.

When the sample time is inherited, Simulink determines the best sample time for the block based on the block's role within the model. To specify inherited sample time, in the createSampleTime, set 'Type' to 'Inherited'. When using inherited sample time, you can alter or error out on specific sample times by specifying the 'AlternatePropagation' or 'ErrorOnPropagation' Name-Value pair.

In fixed-in-minor-step sample time, Simulink does not execute the block at the minor time steps, the updates only occur at the major time steps. To specify the fixed-in-minor time step, in the createSampleTime, set 'Type' to 'Fixed In Minor Step'.

To use controllable sample time, configure a block to specify controllable sample time with a resolution T_base, where T_base is the smallest allowable time interval between block executions. A block using controllable sample time can be dynamically set to execute at n multiples of T_base, then the block's next execution is

To specify T_base in MATLAB System block, in the createSampleTime, set 'Type' to 'Controllable' and set the 'TickTime' property to T_base. You can set the n in your MATLAB System block using setNumTicksUntilNextHit.

For more information on types of sample time, see Types of Sample Time. To see an example on how to control the sample time of the MATLAB System block using System object™ methods, see Specify Sample Time for MATLAB System Block System Objects.