1 | // ---------------------------------------------------------------------- |
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2 | // EXAMPLE: Fermi-Dirac function in C++. |
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3 | // |
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4 | // This simple example shows how to use Rappture within a simulator |
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5 | // written in C++. |
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6 | // ====================================================================== |
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7 | // AUTHOR: Derrick Kearney, Purdue University |
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8 | // Copyright (c) 2005-2009 Purdue Research Foundation |
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9 | // |
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10 | // See the file "license.terms" for information on usage and |
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11 | // redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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12 | // ====================================================================== |
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13 | |
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14 | #include "rappture.h" |
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15 | |
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16 | #include <stdlib.h> |
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17 | #include <stdio.h> |
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18 | #include <math.h> |
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19 | #include <unistd.h> |
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20 | |
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21 | int main(int argc, char * argv[]) { |
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22 | |
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23 | Rappture::Library *lib = NULL; |
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24 | |
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25 | Rappture::Number *T = NULL; |
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26 | Rappture::Number *Ef = NULL; |
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27 | double E = 0.0; |
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28 | double dE = 0.0; |
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29 | double kT = 0.0; |
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30 | double Emin = 0.0; |
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31 | double Emax = 0.0; |
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32 | double f = 0.0; |
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33 | |
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34 | // create a rappture library from the file filePath |
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35 | lib = new Rappture::Library(argv[1]); |
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36 | |
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37 | if (lib == NULL) { |
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38 | // cannot open file or out of memory |
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39 | fprintf(stderr,"FAILED creating Rappture Library\n"); |
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40 | return(1); |
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41 | } |
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42 | |
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43 | T = new Rappture::Number(lib,"temperature"); |
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44 | Ef = new Rappture::Number(lib,"Ef"); |
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45 | |
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46 | if (lib.error() != 0) { |
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47 | // there were errors while retrieving input data values |
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48 | // dump the tracepack |
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49 | fprintf(stderr, lib.traceback()); |
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50 | exit(lib.error()); |
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51 | } |
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52 | |
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53 | kT = 8.61734e-5 * T->value("K"); |
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54 | Emin = Ef->value("eV") - 10*kT; |
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55 | Emax = Ef->value("eV") + 10*kT; |
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56 | |
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57 | dE = 0.005*(Emax-Emin); |
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58 | |
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59 | Rappture::SimpleDoubleBuffer fBuf; |
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60 | Rappture::SimpleDoubleBuffer EBuf; |
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61 | |
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62 | for (E = Emin; E < Emax; E = E + dE) { |
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63 | f = 1.0/(1.0 + exp((E - Ef)/kT)); |
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64 | fBuf.append(f); |
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65 | EBuf.append(E); |
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66 | rpUtilsProgress((int)((E-Emin)/(Emax-Emin)*100),"Iterating"); |
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67 | } |
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68 | const double *fArr = fBuf.data(); |
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69 | const double *EArr = EBuf.data(); |
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70 | size_t nPts = fBuf.nmemb(); |
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71 | |
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72 | const char *curveLabel = "Fermi-Dirac Curve" |
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73 | const char *curveDesc = "Plot of Fermi-Dirac Calculation"; |
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74 | |
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75 | // do it the easy way, |
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76 | // create a plot to add to the library |
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77 | // p1->add(nPts,xArr,yArr,format,curveLabel,curveDesc); |
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78 | |
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79 | Rappture::Plot *p1 = new Rappture::Plot(); |
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80 | p1->add(nPts,fArr,EArr,"",curveLabel,curveDesc); |
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81 | p1.propstr("xlabel","Fermi-Dirac Factor"); |
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82 | p1.propstr("ylabel","Energy"); |
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83 | p1.propstr("yunits","eV"); |
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84 | |
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85 | // add the plot to the library |
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86 | lib.put(p1); |
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87 | |
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88 | |
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89 | // or do it the harder way, |
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90 | // create a curve to add to the library |
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91 | // c1->axis("xaxis","xlabel","xdesc","units","scale",dataArr,nPts); |
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92 | |
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93 | Rappture::Curve *c1 = new Rappture::Curve("output.curve(FDF)"); |
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94 | c1->label(curveLabel); |
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95 | c1->desc(curveDesc); |
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96 | c1->axis("xaxis","Fermi-Dirac Factor","","","",fArr,nPts); |
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97 | c1->axis("yaxis","Energy","","eV","",EArr,nPts); |
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98 | |
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99 | // add the curve to the library |
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100 | lib.put(c1); |
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101 | |
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102 | lib.result(); |
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103 | |
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104 | // clean up memory |
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105 | delete lib; |
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106 | delete p1; |
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107 | delete c1; |
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108 | |
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109 | return 0; |
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110 | } |
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