Initializing discrete states with Matlab functions

Question

retigi 2018-7-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/408887-initializing-discrete-states-with-matlab-functions

回答： Mark McBroom 2018-7-5

I have the following hypothetical system:

The discrete delay element uses input port to initialize its state when enabled. When I check the system steps in debug mode I realized that simulink continue to execute/output "matlab function" even after the delay element is initialized properly. Therefore simulink simply wastes computational power for no reason during simulation phase.

Is there a way to disable the matlab function block after the discrete delay is initialized?

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Answer 1

Mark McBroom 2018-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/408887-initializing-discrete-states-with-matlab-functions#answer_327699

If you have a newer version of MATLAB, you can place your MATLAB Function block in a Simulink Initialize Function block as described here .

Alternately, you can use a pattern similar to the following to enable the MATLAB function for the first timestep only:

1. Put matlab fcn block into an enabled SS 2. Insert a constant block with value of zero, connect that to a unit delay block ( with initial value set to one) and then connect the unit delay block to the enabled SS. This should then only execute your matlab fcn block at init and t+1. It should be disabled for all subsequent time steps.