| 1 | /* |
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| 2 | * ---------------------------------------------------------------------- |
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| 3 | * EXAMPLE: Fermi-Dirac function in C |
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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 | #include "fermi_io.c" |
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| 23 | |
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| 24 | int main(int argc, char * argv[]) { |
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| 25 | |
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| 26 | /* declare variables to interact with Rappture */ |
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| 27 | double T = 0.0; |
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| 28 | double Ef = 0.0; |
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| 29 | Rp_TableColumn *x1 = NULL; |
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| 30 | Rp_TableColumn *y1 = NULL; |
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| 31 | Rp_TableColumn *x2 = NULL; |
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| 32 | Rp_TableColumn *y2 = NULL; |
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| 33 | |
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| 34 | |
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| 35 | /* declare program variables */ |
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| 36 | double E = 0.0; |
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| 37 | double dE = 0.0; |
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| 38 | double kT = 0.0; |
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| 39 | double Emin = 0.0; |
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| 40 | double Emax = 0.0; |
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| 41 | double f = 0.0; |
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| 42 | size_t nPts = 200; |
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| 43 | double EArr[nPts]; |
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| 44 | double EArr2[nPts]; |
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| 45 | double fArr[nPts]; |
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| 46 | double fArr2[nPts]; |
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| 47 | |
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| 48 | /* initialize the global interface */ |
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| 49 | Rp_InterfaceInit(argc,argv,&fermi_io); |
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| 50 | |
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| 51 | /* check the global interface for errors */ |
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| 52 | if (Rp_InterfaceError() != 0) { |
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| 53 | /* there were errors while setting up the interface */ |
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| 54 | /* dump the traceback */ |
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| 55 | Rp_Outcome *o = Rp_InterfaceOutcome(); |
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| 56 | fprintf(stderr, "%s", Rp_OutcomeContext(o)); |
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| 57 | fprintf(stderr, "%s", Rp_OutcomeRemark(o)); |
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| 58 | return(Rp_InterfaceError()); |
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| 59 | } |
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| 60 | |
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| 61 | /* |
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| 62 | * connect variables to the interface |
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| 63 | * look in the global interface for an object named |
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| 64 | * "temperature", convert its value to Kelvin, and |
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| 65 | * store the value into the address of T. |
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| 66 | * look in the global interface for an object named |
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| 67 | * "Ef", convert its value to electron Volts and store |
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| 68 | * the value into the address of Ef. |
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| 69 | * look in the global interface for the columns to |
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| 70 | * store data. retrieve them for later use. |
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| 71 | */ |
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| 72 | Rp_InterfaceConnect("temperature",&T,"units=K",NULL); |
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| 73 | Rp_InterfaceConnect("Ef",&Ef,"units=eV",NULL); |
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| 74 | |
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| 75 | Rp_InterfaceConnect("Fermi-Dirac Factor",x1,NULL); |
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| 76 | Rp_InterfaceConnect("Energy",y1,NULL); |
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| 77 | Rp_InterfaceConnect("Fermi-Dirac Factor * 2",x2,NULL); |
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| 78 | Rp_InterfaceConnect("Energy * 2",y2,NULL); |
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| 79 | |
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| 80 | /* check the global interface for errors */ |
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| 81 | if (Rp_InterfaceError() != 0) { |
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| 82 | /* there were errors while retrieving input data values */ |
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| 83 | /* dump the traceback */ |
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| 84 | Rp_Outcome *o = Rp_InterfaceOutcome(); |
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| 85 | fprintf(stderr, "%s", Rp_OutcomeContext(o)); |
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| 86 | fprintf(stderr, "%s", Rp_OutcomeRemark(o)); |
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| 87 | return(Rp_InterfaceError()); |
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| 88 | } |
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| 89 | |
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| 90 | /* do science calculations */ |
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| 91 | kT = 8.61734e-5 * T; |
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| 92 | Emin = Ef - (10*kT); |
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| 93 | Emax = Ef + (10*kT); |
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| 94 | |
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| 95 | dE = (1.0/nPts)*(Emax-Emin); |
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| 96 | |
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| 97 | E = Emin; |
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| 98 | for(size_t idx = 0; idx < nPts; idx++) { |
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| 99 | E = E + dE; |
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| 100 | f = 1.0/(1.0 + exp((E - Ef)/kT)); |
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| 101 | fArr[idx] = f; |
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| 102 | fArr2[idx] = f*2; |
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| 103 | EArr[idx] = E; |
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| 104 | EArr2[idx] = E*2; |
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| 105 | Rp_UtilsProgress((int)((E-Emin)/(Emax-Emin)*100),"Iterating"); |
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| 106 | } |
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| 107 | |
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| 108 | /* |
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| 109 | * store results in the results table |
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| 110 | * add data to the table pointed to by the variable result. |
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| 111 | * put the fArr data in the column named "Fermi-Dirac Factor" |
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| 112 | * put the EArr data in the column named "Energy" |
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| 113 | */ |
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| 114 | Rp_TableColumnStoreDouble(x1,nPts,fArr); |
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| 115 | Rp_TableColumnStoreDouble(y1,nPts,EArr); |
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| 116 | Rp_TableColumnStoreDouble(x2,nPts,fArr2); |
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| 117 | Rp_TableColumnStoreDouble(y2,nPts,EArr2); |
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| 118 | |
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| 119 | /* |
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| 120 | * close the global interface |
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| 121 | * signal to the graphical user interface that science |
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| 122 | * calculations are complete and to display the data |
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| 123 | * as described in the views |
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| 124 | */ |
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| 125 | Rp_InterfaceClose(); |
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| 126 | |
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| 127 | return 0; |
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| 128 | } |
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