1 | /* |
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2 | * ---------------------------------------------------------------------- |
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3 | * EXAMPLE: Fermi-Dirac function in Python. |
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4 | * |
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5 | * This simple example shows how to use Rappture within a simulator |
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6 | * written in C. |
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7 | * ====================================================================== |
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8 | * AUTHOR: Derrick Kearney, Purdue University |
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9 | * Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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10 | * |
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11 | * See the file "license.terms" for information on usage and |
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12 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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13 | * ====================================================================== |
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14 | */ |
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15 | #include "rappture.h" |
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16 | |
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17 | #include <stdlib.h> |
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18 | #include <stdio.h> |
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19 | #include <math.h> |
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20 | #include <unistd.h> |
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21 | |
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22 | int main(int argc, char * argv[]) { |
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23 | |
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24 | RpLibrary* lib = NULL; |
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25 | |
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26 | const char* data = NULL; |
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27 | char line[100]; |
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28 | |
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29 | double T = 0.0; |
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30 | double Ef = 0.0; |
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31 | double E = 0.0; |
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32 | double dE = 0.0; |
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33 | double kT = 0.0; |
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34 | double Emin = 0.0; |
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35 | double Emax = 0.0; |
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36 | double f = 0.0; |
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37 | |
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38 | int err = 0; |
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39 | |
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40 | /* create a rappture library from the file filePath */ |
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41 | lib = rpLibrary(argv[1]); |
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42 | |
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43 | if (lib == NULL) { |
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44 | /* cannot open file or out of memory */ |
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45 | printf("FAILED creating Rappture Library\n"); |
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46 | return(1); |
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47 | } |
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48 | |
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49 | |
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50 | rpGetString(lib,"input.number(temperature).current",&data); |
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51 | T = rpConvertDbl(data, "K", &err); |
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52 | if (err) { |
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53 | printf ("Error while retrieving input.number(temperature).current\n"); |
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54 | return(1); |
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55 | } |
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56 | |
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57 | |
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58 | rpGetString(lib,"input.number(Ef).current",&data); |
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59 | Ef = rpConvertDbl(data, "eV", &err); |
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60 | if (err) { |
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61 | printf ("Error while retrieving input.number(Ef).current\n"); |
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62 | return(1); |
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63 | } |
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64 | |
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65 | kT = 8.61734e-5 * T; |
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66 | Emin = Ef - 10*kT; |
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67 | Emax = Ef + 10*kT; |
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68 | |
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69 | E = Emin; |
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70 | dE = 0.005*(Emax-Emin); |
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71 | |
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72 | rpPutString ( lib, |
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73 | "output.curve(f12).about.label", |
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74 | "Fermi-Dirac Factor", |
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75 | RPLIB_OVERWRITE ); |
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76 | rpPutString ( lib, |
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77 | "output.curve(f12).xaxis.label", |
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78 | "Fermi-Dirac Factor", |
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79 | RPLIB_OVERWRITE ); |
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80 | rpPutString ( lib, |
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81 | "output.curve(f12).yaxis.label", |
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82 | "Energy", |
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83 | RPLIB_OVERWRITE ); |
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84 | rpPutString ( lib, |
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85 | "output.curve(f12).yaxis.units", |
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86 | "eV", |
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87 | RPLIB_OVERWRITE ); |
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88 | |
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89 | while (E < Emax) { |
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90 | f = 1.0/(1.0 + exp((E - Ef)/kT)); |
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91 | sprintf(line,"%f %f\n",f, E); |
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92 | rpUtilsProgress((int)((E-Emin)/(Emax-Emin)*100),"Iterating"); |
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93 | rpPutString(lib,"output.curve(f12).component.xy", line, RPLIB_APPEND); |
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94 | E = E + dE; |
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95 | } |
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96 | |
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97 | rpResult(lib); |
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98 | return 0; |
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99 | } |
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