MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung PDF herunterladen (Seite 73)

Specify Intergeneration Times for Entities

3-7

Role of initial seed for uniform and exponential distributions

If you set Distribution to Uniform or Exponential, the dialog box includes an Initial

seed parameter. This parameter specifies the seed on which the stream of random

numbers is based. For a fixed seed, the random behavior is repeatable the next time

you run the simulation. Changing the seed changes the stream of random numbers.

Typically, you would set the Initial seed parameter to a large (for example, five-digit)

odd number.

Specify Other Probability Distributions

Entity intergeneration times can follow any distribution that the Event-Based Random

Number block supports. To specify the distribution, set up your model as follows:

In the Time-Based Entity Generator block, set the Generate entities with

parameter to Intergeneration time from port t. A signal input port labeled t

appears on the block.

In your model, insert the Event-Based Random Number block. Connect it to the t

signal input port of the Time-Based Entity Generator block.

In the Event-Based Random Number block dialog box, set parameters to describe the

probability distribution that you want to use for entity intergeneration times. For an

example, see “Use an Arbitrary Discrete Distribution as Intergeneration Time” on

page 3-9.

During the simulation, each time that the Time-Based Entity Generator block generates

an entity, the Event-Based Random Number block generates a new random number

which becomes the duration until the next entity generation.

How to Specify Intergeneration Times from a Signal

If you want to provide intergeneration times explicitly as values of a signal, set up your

model as follows:

In the Time-Based Entity Generator block, set the Generate entities with

parameter to Intergeneration time from port t. A signal input port labeled t

appears on the block.

In your model, create an event-based signal whose value at each generation time is

the time until the next entity generation.

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MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung Seite 73