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<div id="projectbrief">Simulate the change in energy and magnetization in a ferro magnet</div>
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<div class="headertitle"><div class="title">phase_transition.cpp</div></div>
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<a href="phase__transition_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/** @file phase_transition.cpp</span></div>
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<div class="line"><span class="lineno"> 2</span><span class="comment"> *</span></div>
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<div class="line"><span class="lineno"> 3</span><span class="comment"> * @author Cory Alexander Balaton (coryab)</span></div>
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<div class="line"><span class="lineno"> 4</span><span class="comment"> * @author Janita Ovidie Sandtrøen Willumsen (janitaws)</span></div>
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<div class="line"><span class="lineno"> 5</span><span class="comment"> *</span></div>
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<div class="line"><span class="lineno"> 6</span><span class="comment"> * @version 1.0</span></div>
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<div class="line"><span class="lineno"> 7</span><span class="comment"> *</span></div>
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<div class="line"><span class="lineno"> 8</span><span class="comment"> * @brief Sweep over different temperatures and generate data.</span></div>
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<div class="line"><span class="lineno"> 9</span><span class="comment"> *</span></div>
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<div class="line"><span class="lineno"> 10</span><span class="comment"> * @details This program takes in 4 arguments: the start temperature,</span></div>
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<div class="line"><span class="lineno"> 11</span><span class="comment"> * the end temperature, the amount of temperature points to simulate, and</span></div>
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<div class="line"><span class="lineno"> 12</span><span class="comment"> * the amount of monte carlo samples to collect, in that order.</span></div>
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<div class="line"><span class="lineno"> 13</span><span class="comment"> *</span></div>
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<div class="line"><span class="lineno"> 14</span><span class="comment"> * @bug No known bugs</span></div>
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<div class="line"><span class="lineno"> 15</span><span class="comment"> * */</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <a class="code" href="data__type_8hpp.html" title="Header for the data_t type.">"data_type.hpp"</a></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <a class="code" href="monte__carlo_8hpp.html" title="Functions for Monte Carlo simulations.">"monte_carlo.hpp"</a></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <a class="code" href="utils_8hpp.html" title="Function prototypes and macros that are useful.">"utils.hpp"</a></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> </div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <span class="preprocessor"><</span><span class="preprocessor">getopt</span><span class="preprocessor">.</span><span class="preprocessor">h</span><span class="preprocessor">></span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <span class="preprocessor"><</span><span class="preprocessor">omp</span><span class="preprocessor">.</span><span class="preprocessor">h</span><span class="preprocessor">></span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="preprocessor">#</span><span class="preprocessor">include</span> <span class="preprocessor"><</span><span class="preprocessor">string</span><span class="preprocessor">></span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment">/** @brief A function that displays how to use the program and quits.*/</span></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"><a class="line" href="phase__transition_8cpp.html#ac907e18135856c90366aaa599a9e10b1"> 25</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="main_8cpp.html#ac907e18135856c90366aaa599a9e10b1">usage</a>(std::string filename)</div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span>{</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> std::cout << <span class="stringliteral">"Usage: "</span> << filename</div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> << <span class="stringliteral">" <start temperature> <end temperature> <points> "</span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> <span class="stringliteral">"<lattice size> <cycles> <burn-in-time> <output file>\n\n"</span></div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> << <span class="stringliteral">"\t[ -h | --help ]\n"</span>;</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> exit(-1);</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span>}</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">/** @brief The main function.*/</span></div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="phase__transition_8cpp.html#a3c04138a5bfe5d72780bb7e82a18e627"> 35</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="main_8cpp.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>{</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// Command options</span></div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">struct</span> option long_options[] = {{<span class="stringliteral">"help"</span>, 0, 0, 0}, {NULL, 0, NULL, 0}};</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordtype">int</span> option_index = -1;</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordtype">int</span> c;</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">while</span> (<span class="keyword">true</span>) {</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> c = getopt_long(argc, argv, <span class="stringliteral">"h"</span>, long_options, &option_index);</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keywordflow">if</span> (c == -1)</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keywordflow">switch</span> (c) {</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keywordflow">case</span> 0:</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">switch</span> (option_index) {</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keywordflow">case</span> 0: <span class="comment">// Not a mistake. This just goes to the default.</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keywordflow">default</span>:</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> usage(argv[0]);</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> }</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordflow">break</span>;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keywordflow">case</span> <span class="stringliteral">'h'</span>:</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keywordflow">default</span>:</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> usage(argv[0]);</div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> }</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> }</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// Check that the number of arguments is at least 8.</span></div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordflow">if</span> (argc < 8) {</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> usage(argv[0]);</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> }</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// Timing variables</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordtype">double</span> t0, t1;</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> t0 = omp_get_wtime();</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// Define/initialize variables</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordtype">double</span> start = atof(argv[1]), end = atof(argv[2]);</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="keywordtype">int</span> points = atoi(argv[3]), cycles = atoi(argv[5]), L = atoi(argv[4]),</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> burn_in_time = atoi(argv[6]), N = L * L;</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> std::string outfile = argv[7];</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> montecarlo<a class="code hl_function" href="monte__carlo_8hpp.html#a34e9c3e24f26760693266b8a7b6b3d21">::</a><a class="code hl_function" href="monte__carlo_8hpp.html#a34e9c3e24f26760693266b8a7b6b3d21">phase_transition</a>(L, start, end, points, cycles,</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> montecarlo<a class="code hl_function" href="monte__carlo_8hpp.html#ae1e7f904ecfc3d8f3c4dd1ef155dd771">::</a><a class="code hl_function" href="monte__carlo_8hpp.html#ae1e7f904ecfc3d8f3c4dd1ef155dd771">mcmc_parallel</a>, outfile, burn_in_time);</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> t1 = omp_get_wtime();</div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> std::cout << <span class="stringliteral">"Time: "</span> << t1 - t0 << <span class="stringliteral">" seconds\n"</span>;</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>}</div>
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<div class="ttc" id="amain_8cpp_html_a3c04138a5bfe5d72780bb7e82a18e627"><div class="ttname"><a href="main_8cpp.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a></div><div class="ttdeci">int main(int argc, char **argv)</div><div class="ttdoc">The main function.</div><div class="ttdef"><b>Definition:</b> <a href="main_8cpp_source.html#l00125">main.cpp:125</a></div></div>
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<div class="ttc" id="amain_8cpp_html_ac907e18135856c90366aaa599a9e10b1"><div class="ttname"><a href="main_8cpp.html#ac907e18135856c90366aaa599a9e10b1">usage</a></div><div class="ttdeci">void usage(std::string filename)</div><div class="ttdoc">A function that displays how to use the program and quits.</div><div class="ttdef"><b>Definition:</b> <a href="main_8cpp_source.html#l00110">main.cpp:110</a></div></div>
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<div class="ttc" id="amonte__carlo_8hpp_html_a34e9c3e24f26760693266b8a7b6b3d21"><div class="ttname"><a href="monte__carlo_8hpp.html#a34e9c3e24f26760693266b8a7b6b3d21">montecarlo::phase_transition</a></div><div class="ttdeci">void phase_transition(int L, double start_T, double end_T, int points_T, int cycles, std::function< data_t(int, double, int, int)> monte_carlo, std::string outfile, int burn_in_time=BURN_IN_TIME)</div><div class="ttdoc">Perform the MCMC algorithm using a range of temperatures.</div><div class="ttdef"><b>Definition:</b> <a href="monte__carlo_8cpp_source.html#l00169">monte_carlo.cpp:169</a></div></div>
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<div class="ttc" id="amonte__carlo_8hpp_html_ae1e7f904ecfc3d8f3c4dd1ef155dd771"><div class="ttname"><a href="monte__carlo_8hpp.html#ae1e7f904ecfc3d8f3c4dd1ef155dd771">montecarlo::mcmc_parallel</a></div><div class="ttdeci">data_t mcmc_parallel(int L, double T, int cycles, int burn_in_time=BURN_IN_TIME)</div><div class="ttdoc">Execute the Metropolis algorithm for a certain amount of Monte Carlo cycles in parallel.</div><div class="ttdef"><b>Definition:</b> <a href="monte__carlo_8cpp_source.html#l00141">monte_carlo.cpp:141</a></div></div>
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