MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung PDF herunterladen (Seite 75)

Specify Intergeneration Times for Entities

3-9

Parameter Values Simulation Results

• Distribution = Uniform

• Minimum = 1

• Maximum = 3

The first entity, generated at T=0, appears in

the plot at T=1 after its service is complete.

The second entity, generated at a random time

between T=1 and T=3, appears in the plot

between T=2 and T=4.

• Distribution = Uniform

• Minimum = 1

• Maximum = 1.5

The plot might show more entities compared

to the preceding scenario because the range of

intergeneration times has the same minimum

but a smaller maximum.

• Distribution = Exponential

• Mean = 0.5

This system is called an M/D/1 queuing

system, where the M stands for Markovian

and indicates a Poisson arrival rate. The

exponential distribution has no upper bound,

so the time between successive entities could be

any positive number.

Use an Arbitrary Discrete Distribution as Intergeneration Time

This example uses the Event-Based Random Number block to generate entities at

intervals of 1, 1.5, or 2 seconds.

The Event-Based Random Number block has these parameters:

• Distribution = Arbitrary discrete

• Value vector = [1 1.5 2]

• Probability vector = [0.25 0.5 0.25]

As a result, the block generates intergeneration times Δt such that

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 113 114

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MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung Seite 75