Doxygen Source Code Documentation
model_trnglwave_ap.c File Reference
#include <math.h>#include "NLfit_model.h"Go to the source code of this file.
Functions | |
| void | signal_model (float *gs, int ts_length, float **x_array, float *ts_array) |
| DEFINE_MODEL_PROTOTYPE MODEL_interface * | initialize_model () |
Function Documentation
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Definition at line 40 of file model_trnglwave_ap.c. References MODEL_interface::call_func, MODEL_interface::label, MODEL_interface::max_constr, MODEL_interface::min_constr, MODEL_SIGNAL_TYPE, MODEL_interface::model_type, MODEL_interface::params, MODEL_interface::plabel, signal_model(), and XtMalloc.
00041 {
00042 MODEL_interface * mi = NULL;
00043
00044
00045 /*----- allocate memory space for model interface -----*/
00046 mi = (MODEL_interface *) XtMalloc (sizeof(MODEL_interface));
00047
00048
00049 /*----- define interface for the triangular wave model -----*/
00050
00051 /*----- name of this model -----*/
00052 strcpy (mi->label, "TrnglrWave_AP");
00053
00054 /*----- this is a signal model -----*/
00055 mi->model_type = MODEL_SIGNAL_TYPE;
00056
00057 /*----- number of parameters in the model -----*/
00058 mi->params = 2;
00059
00060 /*----- parameter labels -----*/
00061 strcpy (mi->plabel[0], "amplitude");
00062 strcpy (mi->plabel[1], "phase");
00063
00064 /*----- minimum and maximum parameter constraints -----*/
00065 mi->min_constr[0] = -100.0; mi->max_constr[0] = 100.0;
00066 mi->min_constr[1] = -90.0; mi->max_constr[1] = 0.00;
00067
00068 /*----- function which implements the model -----*/
00069 mi->call_func = &signal_model;
00070
00071
00072 /*----- return pointer to the model interface -----*/
00073 return (mi);
00074 }
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Definition at line 89 of file model_trnglwave_ap.c. Referenced by initialize_model().
00096 {
00097 const float FREQ = 0.125; /* frequency of the triangular wave */
00098 int it; /* time index */
00099 float t; /* time */
00100 float fval; /* time series value at time t */
00101 float cycles; /* number of cycles since initial time */
00102
00103
00104 /*----- calculate time series corresponding to the given parameters -----*/
00105 for (it = 0; it < ts_length; it++)
00106 {
00107 t = x_array[it][1];
00108 cycles = FREQ*t + gs[1]/360.0;
00109 cycles = cycles - (int)cycles;
00110 if (cycles <= 0.25)
00111 fval = gs[0] * (cycles/0.25);
00112 else
00113 if ((cycles > 0.25) && (cycles <= 0.75))
00114 fval = gs[0] * (2.0 - (cycles/0.25));
00115 else
00116 fval = gs[0] * ((cycles/0.25) - 4.0);
00117 ts_array[it] = fval;
00118 }
00119
00120 }
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