Compare data at consecutive timesteps during runtime in Simulink

Question

Ben Milne 2020-8-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/584669-compare-data-at-consecutive-timesteps-during-runtime-in-simulink

回答： Fangjun Jiang 2020-8-26

Hi all,

I'm trying to create a parachute model system for a rocket that will deploy when the altitude begins to decrease i.e. altitude at timestep n < altitude at timestep n-1.

I'm not entirely sure what the best way is to do this. I've played around with setting the altitude as a parameter of a masked subsystem but this didn't really work and made the simulation run significantly slower. Is there a fast way to extract a previous value of a logged signal?

Thanks!