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randomnumbers.erlang - Function

	Package	utility
	Module	mathematics
	Tool	randomnumbers

Generate random numbers that have an Erlang distribution.

Synopsis
erlang(mean, variance, shape)

Description
The erlang function will generate numbers that follow a erlang, or Gamma distribution. See the general tool description for a mathematical definition of the probability density function.

The mean can be any real number except zero and the variance must be a positive number. The result will be floating point numbers in the range 0 < x < $\infty$ if the mean is positive and in the range - $\infty$ < x < 0 if it is negative. The shape can be either an integer or a vector of integers where all the values are greater than zero. The default value of one will produce a scalar output.

Arguments

mean	in	Mean of the distribution
		Allowed:	double
		Default:	1.0
variance	in	Variance of the distribution
		Allowed:	double
		Default:	1.0
shape	in	Shape of the output array
		Allowed:	integer or a vector of integers
		Default:	1

Returns
A floating point scalar or array.

Example

      include 'randomnumbers.g'
      rand := randomnumbers();
      print rand.erlang(4, 8);
      rand.done()

This example will print a random number from the erlang distribution.