How do I model POISSON arrivals ?

[ROBERT SOUSEK]

I noticed in the distribution section there is no provision for random numbers from a poisson distribution.

.  What do I use as a substitute?

[Harry King]

Robert,

The inter-arrival times for the events in a Poisson process follow a negative-exponential distribution. The ExponentialDistribution object implements this distribution in JaamSim.

Do you want to actually sample a Poisson distribution? We haven't implemented any of the discrete distributions such as Poisson, Binomial, etc. simply because we couldn't think of a use case. If this is what you need, you can calculate the probabilities for each outcome from a Poisson distribution and enter them in a DiscreteDistribution.

Harry

[ROBERT SOUSEK]

OK, I knew there was another way.  However, the academic types(Industrial Engineering. Operations Research) would probably like to see those discrete distributions.  

The Birth/Death Process (Poisson arrivals, Exponential service times) may be a big selling pont/feature as you try to implement JaamSim into the universities...

[Jose Antonio Medrano Garcia]

Remember that for a Poisson process,  rate of arrival = 1/inter-arrival time and the inter-arrival time for a Poisson process is exponential so  you can use that workaround.