ASE2 CARD CATALOG ENTRY

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ASSET OVERVIEW

UNIT NAME

RAN3

VERSION

1.0

REVIEW CODE

CS(Verdix Ada/Sun); ES; AR; C1 1.0 A

INET ADDRESS

gralia@capsrv.jhuapl.edu

AUTHOR

Mars J. Gralia
Applied Physics Laboratory
The Johns Hopkins University
Laurel, Maryland 20723

RIGHTS

Released to Ada Community

COPYRIGHT

(c) 1991 Mars J. Gralia

DATE CREATED

23-Jan-88

DATE RELEASED

30-Jan-91

DATE LAST UPDATED

30-Jan-91

LOCATION

ASR

ENVIRONMENT

---- Host ----
Target Hardware O.S. Compiler-vendors
host DEC-VAX VMS DEC-Ada
host Sun-4 SunOS Verdix
host Sun-3 SunOS Alsys, Verdix
host IBM-PC (80286) DOS Alsys, Meridian
Motorola 68020 (bare) DEC-VAX VMS XD-Ada
Motorola 68030 (bare) DEC-VAX VMS XD-Ada

LIMITATIONS

CERTIFICATION

Ada System Certifier_1 1.0
Date/Time of Processing: Monday    30 May       1994 06:07:55Pm
Overall Assessment of System: OK
Classification of System: A
Basis of Classification --
    Syntax Errors                               PASS
    Completeness                                PASS
    Independence from External Libraries        PASS
    Independence from a Specific Ada Compiler   PASS

Number of ...
  Files               4
  Library Units       4
  Lines            1597
  Statements        170
  Comments         1087

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CLASSIFICATION

KEYWORD

random
numbers
variables
Gaussian

INDEX

Random Number Generator
Gralia, Mars J.
John Hopkins Univ

DEPENDENCIES

SEE ALSO

SHORT DESCRIPTION

Random number generator for uniform or Gaussian

TAXONOMY

Software Components

Random Number Generator

RAN (3)

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FILE LISTING

FILE SPECS

Click here to enter Asset Directory/transfer Asset File(s): ../../ase02_02/comps/ran/ran3

DIRECTORY DISPLAY

Follow path to see directory

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ABSTRACT

Random Number Generator Functions

This is a collection of random "number" generator functions.

There are two principal packages: Random_Unit provides floating point random numbers uniform on 0.0 .. 1.0. Random_Pkg generalizes that to produce random variables of many different types, including enumeration sets. The distribution from which the sample is taken may be uniform or Gaussian.

A major design goal is machine/compiler independence.

Both packages are "sequential," to use Booch's lexicon: each must be used by those programs which contain only a single thread of control.

The algorithm used in Random_Unit was developed by George Marsaglia. It was then specifically programmed and tested and in Ada before publication as ``An Ada Implementation of Marsaglia's "Universal" Random Number Generator,'' M.G. Harmon and T.P. Baker, ACM Ada Letters, volume 8, number 2 (pages 110-112), March/April 1988.

Random_Pkg provides the generators:

Name            Data Type          Range
a) Even
a1) Uniform      Float              [0.0,1.0)
a2) Gen_Integer  Generic integer    (full)
a3) Gen_Float    Generic float      (full; digits <= 6)
a4) Gen_Discrete Generic enumerated (full)
b) Gaussian
b1) Simplex      Float              (full)
b2) Gen_Float    Generic float      (full; digits <=6)

Gaussian generators can have any range, mean and standard deviation.

Several test programs are included.

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REVISION HISTORY

DATE         VERSION	AUTHOR                  HISTORY
30-Jan-91      1.0   Gralia,Hubbs and Douglas Initial Release

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RELEASE NOTICE

This prologue must be included in all copies of this software.
This software is copyright by the author.
This software is released to the Ada community.
Restrictions on use or distribution:  it may be freely copied
provided the author's name and copyright notice is retained 
intact.

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DISCLAIMER

	This software and its documentation are provided "AS IS" and
without any expressed or implied warranties whatsoever.  No warranties
as to performance, merchantability, or fitness for a particular
purpose exist.
	The user is advised to test the software thoroughly before
relying on it.  The user must assume the entire risk and liability of
using this software.  In no event shall any person or organization of
people be held responsible for any direct, indirect, consequential or
inconsequential damages or lost profits.

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