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OS/2 Shareware BBS: Science
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DLL
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GAUSS5.C
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C/C++ Source or Header
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1994-11-22
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5KB
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159 lines
#define INCL_WIN
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <os2.h>
#include <float.h>
#define STDCOL 5
#define XSLOT 0
#define YSLOT 1
#define CALCSLOT -3
#define BESTSLOT -2
#define FLAGSLOT -1
/* static data and parameters */
static double *data; /* start of complete data array */
/* The data is all in a contigous block starting with datx then daty followed by
* zero or more additional data columns as read in from the data file. The last
* three slots are: datt , the current best results and the flag array.
* Each point not in an exclusion zone has its corresponding flag TRUE.
*/
static double *datx; /* x data read in from data file */
static double *daty; /* y data read in from data file */
static double *datt; /* generated data */
static int Ndat; /* number of data points */
static char firsttime;
static double **Ptr; /* pointer to parameter pointer array */
struct info_line
{
char *line;
};
/*****************************************************************************/
/* Do not modify any code not enclosed by this and the end banner */
/*****************************************************************************/
/* the next two values are compared to values passed by the program as check */
/* NADD is the number of additional data columns required for this function */
/* NPARAM is the number of parameters required by this function */
#define NADD 0
#define NPARAM 16
/* edit the following lines or add and delete new lines */
static struct info_line dll_info[] = {
"This function calculates five gaussians.",
"It requires 16 parameters as follows:",
"P1 is the constant background.",
"P2 is the center posiion of gaussian 1 along the x axis.",
"P3 is the amplitude of gaussian 1.",
"P4 is the width of gaussian 1.",
"P5 is the center posiion of gaussian 2 along the x axis.",
"P6 is the amplitude of gaussian 2.",
"P7 is the width of gaussian 2.",
"P8 is the center posiion of gaussian 3 along the x axis.",
"P9 is the amplitude of gaussian 3.",
"P10is the width of gaussian 3.",
"P11 is the center posiion of gaussian 4 along the x axis.",
"P12 is the amplitude of gaussian 4.",
"P13 is the width of gaussian 4.",
"P14 is the center posiion of gaussian 5 along the x axis.",
"P15 is the amplitude of gaussian 5.",
"P16 is the width of gaussian 5.",
NULL};
VOID EXPENTRY fitfunc(void)
{
int i;
double wid1, wid2;
double wid3, wid4, wid5;
double amp1, amp2;
double amp3, amp4, amp5;
double pos1, pos2;
double pos3, pos4, pos5;
double E1, E2;
double E3, E4, E5;
double gau1, gau2;
double gau3, gau4, gau5;
double offset;
/* The next section is executed the first time through only */
/* so put any initialization code in here */
if (firsttime)
{
firsttime = FALSE;
/* Mask off all floating point exceptions */
_control87(MCW_EM,MCW_EM);
}
/* give parameters more meaningful names */
offset=*Ptr[1];
pos1 = *Ptr[2];
amp1 = *Ptr[3];
wid1 = *Ptr[4];
pos2 = *Ptr[5];
amp2 = *Ptr[6];
wid2 = *Ptr[7];
pos3 = *Ptr[8];
amp3 = *Ptr[9];
wid3 = *Ptr[10];
pos4 = *Ptr[11];
amp4 = *Ptr[12];
wid4 = *Ptr[13];
pos5 = *Ptr[14];
amp5 = *Ptr[15];
wid5 = *Ptr[16];
/* This is the main loop that calculates the function datt[] */
/* for all data points. Put your function in the loop body */
for (i = 0;i < Ndat;i++)
{
E1 = datx[i] - pos1;
E2 = datx[i] - pos2;
E3 = datx[i] - pos3;
E4 = datx[i] - pos4;
E5 = datx[i] - pos5;
gau1 = amp1 * exp(-E1*E1/wid1/wid1); /*Gaussian */
gau2 = amp2 * exp(-E2*E2/wid2/wid2);
gau3 = amp3 * exp(-E3*E3/wid3/wid3);
gau4 = amp4 * exp(-E4*E4/wid4/wid4);
gau5 = amp5 * exp(-E5*E5/wid5/wid5);
datt[i] = gau1 + gau2 + gau3 + gau4 + gau5 +offset;
}
}
/*****************************************************************************/
/* Do not modify any code not enclosed by this and the start banner */
/*****************************************************************************/
char EXPENTRY init_dll_globals(int N,int mb,int NP,double *dat,double *p[])
{
/* set globals */
firsttime = TRUE;
Ndat = N;
if (NADD != mb - STDCOL) return -1;
if (NPARAM != NP) return -2;
/* set array pointers */
data = dat;
daty = dat + N;
datx = dat;
datt = dat + (mb + CALCSLOT) * N; /* the calculated data goes into the third last slot */
/* set parameter pointers */
Ptr = p;
return 0;
}
struct info_line * EXPENTRY get_dll_info(void)
{
/* return pointer to array of info strings set up above */
return dll_info;
}