I change the arrival time in the entity generator but the scope for entities departured stay the same (simulink)

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john
john 2025-1-19
回答： Pratyush Swain 2025-1-20
In the entity generator block, I have changed the source to matlab action and in the insert pattern I have put exponential. I am assuming by setting the mean to 5 this means that 5 entities arrive in each time unit. In the statistics I have enabled the number of departed entities and connected it with a scope. I change the mean from 5 to 0.5 or 1 or whatever and the scope still stays the same. Is this some bug or I am doing something wrong? I tested this both on online simulink and on my downloaded matlab and the result is the same.

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Pratyush Swain
Pratyush Swain 2025-1-20
Hi John,
The mean parameter of the exponential distribution affects the inter-arrival time of entities, not the number of entities arriving per unit time.This means when the set a pattern for exponential distribution with mean = 5, on average, entity will arrive every 5 time units.
Similarly,
  • If m = 5: On average, 1 entity arrives every 5 time units.
  • If m = 1: On average, 1 entity arrives every 1 time unit (faster arrivals).
  • If m = 0.5: On average, 1 entity arrives every 0.5 time units (very fast arrivals).
For more information on event action and random number generation, please refer to https://www.mathworks.com/help/simevents/ug/event-action-languages.html
Hope this helps.

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