1 /* Copyright (C) 2006-2008 Joris Mooij [j dot mooij at science dot ru dot nl]
2 Radboud University Nijmegen, The Netherlands
4 This file is part of libDAI.
6 libDAI is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 libDAI is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with libDAI; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <boost/random/linear_congruential.hpp>
24 #include <boost/random/uniform_real.hpp>
25 #include <boost/random/normal_distribution.hpp>
26 #include <boost/random/variate_generator.hpp>
31 // Assume POSIX compliant system. We need the following for querying the CPU time for this process
32 #include <sys/times.h>
33 #include <sys/param.h>
40 // Returns user+system time in seconds
45 return( (double)(tbuf
.wSecond
+ (double)tbuf
.wMilliseconds
/ 1000.0) );
49 return( (double)(tbuf
.tms_utime
+ tbuf
.tms_stime
) / HZ
);
54 // This is a typedef for a random number generator.
55 // Try boost::mt19937 or boost::ecuyer1988 instead of boost::minstd_rand
56 typedef boost::minstd_rand _rnd_gen_type
;
58 _rnd_gen_type
_rnd_gen(42U);
60 // Define a uniform random number distribution which produces
61 // values between 0 and 1 (0 inclusive, 1 exclusive).
62 boost::uniform_real
<> _uni_dist(0,1);
63 boost::variate_generator
<_rnd_gen_type
&, boost::uniform_real
<> > _uni_rnd(_rnd_gen
, _uni_dist
);
65 // Define a normal distribution with mean 0 and standard deviation 1.
66 boost::normal_distribution
<> _normal_dist
;
67 boost::variate_generator
<_rnd_gen_type
&, boost::normal_distribution
<> > _normal_rnd(_rnd_gen
, _normal_dist
);
70 void rnd_seed( size_t seed
) {
74 double rnd_uniform() {
78 double rnd_stdnormal() {
82 // Returns integer in interval [min, max]
83 int rnd_int( int min
, int max
) {
84 return (int)floor(_uni_rnd() * (max
+ 1 - min
) + min
);
88 } // end of namespace dai