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Exponential Distribution
Numbers drawn from an exponential population represent the
time between events given the mean time. For example, the time
between the arrival of two customers. The result returned by this
function is always a positive number.
The exponential distribution is a special application of the
Gamma random number generator grand
where the number of events is set to one.
The grand primitive, when
used to generate exponential deviates, has the format
grand( mean )
Probability Density Function for a node using the
Exponential distribution with a mean time between events of 2; grand(2).
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