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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