Initializing discrete states with Matlab functions

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?

Answer 1

[Mark McBroom]

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.