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### RANDOMNUMBERGENERATOR__DEFINE

RANDOMNUMBERGENERATOR__DEFINE

## Name

RANDOMNUMBERGENERATOR

## Purpose

Allows the user to obtain a sequence of pseudo-random numbers. The
object maintains the random number generator seed in such a way that
subsequent calls to GetRandomNumbers will guarentee that you don't
get the same random numbers each time you ask for random numbers.

## Author

FANNING SOFTWARE CONSULTING
David Fanning, Ph.D.
1645 Sheely Drive
Fort Collins, CO 80526 USA
Phone: 970-221-0438
E-mail: david@idlcoyote.com
Coyote's Guide to IDL Programming: http://www.idlcoyote.com

Utilities

## Calling Sequence

Generate three random numbers.
IDL> rng = Obj_New('RandomNumberGenerator', initialSeed)
IDL> numberOfNumbersNeeded = 3
IDL> randomNumbers = rng -> GetRandomNumbers(numberOfNumbersNeeded)
IDL> Print, randomNumbers
0.80952855 0.35878432 0.52150406

Generate a sequence of 8 random digits.
IDL> Print, rng -> GetRandomDigits(8)
21855786
INPUT PARAMETERS FOR INIT METHOD:
initialSeed: The initial seed for the random number generator. If undefined
or absent, the number of seconds after 1 January 1970 is used.

## Methods

randomNumbers -> GetRandomNumbers(d1, d2, d3, d4 d5, d6, d7, d8)
randomDigits = obj -> GetRandomDigits(numDigets)
obj -> SetSeed, seed

## Modification History

Written by David W. Fanning, 13 November 2009.
Added GetRandomDigits method. 7 February 2010. DWF.
Incorrect cleanup of the seed pointer fixed in the CLEANUP procedure.
25 February 2010, DWF.

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