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NM_TC/Random_Stream.h
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1 /*
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2 * Copyright (c) 2015 University of Lübeck
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 *
22 * AUTHORS: Michael Schellenberger Costa: mschellenbergercosta@gmail.com
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23 * Stefanie Gareis: gareis@inb.uni-luebeck.de
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24 */
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25
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26 /******************************************************************************/
27 /* Random number streams */
28 /******************************************************************************/
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29 #pragma once
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30 #include <random>
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31
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32 class randomStreamNormal {
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33 public:
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34 explicit randomStreamNormal(double mean, double stddev)
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35 : mt(rand()), norm_dist(mean, stddev) {}
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36 explicit randomStreamNormal(double mean, double stddev, double seed)
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37 : mt(seed), norm_dist(mean, stddev) {}
38
39 double operator ()(void) { return norm_dist(mt); }
40 private:
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41 std::mt19937_64 mt;
42 std::normal_distribution<double> norm_dist;
43 };
44
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45 class randomStreamUniformInt {
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46 public:
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47 explicit randomStreamUniformInt(int lower_bound, int upper_bound)
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48 : mt(rand()), uniform_dist(lower_bound, upper_bound) {}
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49 explicit randomStreamUniformInt(int lower_bound, int upper_bound, double seed)
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50 : mt(seed), uniform_dist(lower_bound, upper_bound) {}
51
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52 int operator ()(void) { return uniform_dist(mt); }
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53 private:
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54 std::mt19937_64 mt;
55 std::uniform_int_distribution<> uniform_dist;
56 };