| 1 | /**************************************************************************
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| 2 | *
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| 3 | * random.h -- pseudo random number generator
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| 4 | * Copyright (C) 1994 Chris Wallace ([email protected])
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License as published by
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| 8 | * the Free Software Foundation; either version 2 of the License, or
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| 9 | * (at your option) any later version.
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| 10 | *
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| 11 | * This program is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | * GNU General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU General Public License
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| 17 | * along with this program; if not, write to the Free Software
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| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 19 | *
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| 20 | * $Id: random.h 3745 2003-02-20 21:20:24Z mdewsnip $
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| 21 | *
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| 22 | **************************************************************************/
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| 23 |
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| 24 | /*
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| 25 | $Log$
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| 26 | Revision 1.1 2003/02/20 21:14:16 mdewsnip
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| 27 | Addition of MG package for search and retrieval
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| 28 |
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| 29 | Revision 1.1 1999/08/10 21:16:58 sjboddie
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| 30 | renamed mg-1.3d directory mg
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| 31 |
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| 32 | Revision 1.1 1998/11/17 09:32:21 rjmcnab
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| 33 | *** empty log message ***
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| 34 |
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| 35 | */
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| 36 |
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| 37 | #ifndef RANDOM_H
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| 38 | #define RANDOM_H
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| 39 |
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| 40 | /*
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| 41 | * A random number generator called as a function by
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| 42 | * random (iseed) or irandm (iseed)
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| 43 | * The parameter should be a pointer to a 2-element long vector.
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| 44 | * The first function returns a double uniform in 0 .. 1.
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| 45 | * The second returns a long integer uniform in 0 .. 2**31-1
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| 46 | * Both update iseed[] in exactly the same way.
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| 47 | * iseed[] must be a 2-element integer vector.
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| 48 | * The initial value of the second element may be anything.
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| 49 | *
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| 50 | * The period of the random sequence is 2**32 * (2**32-1)
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| 51 | * The table mt[0:127] is defined by mt[i] = 69069 ** (128-i)
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| 52 | */
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| 53 |
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| 54 | double random (long is [2]);
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| 55 | long irandm (long is [2]);
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| 56 |
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| 57 | #endif
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