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/*****************************************************************************
* Johns Hopkins University
* Center For Astrophysical Sciences
* FUSE
*****************************************************************************
*
* Description: Assigns wavelength to each photon in data stream.
*
* Returns: 0 upon successful completion.
*
* History: 05/15/06 1.1 wvd Adapt from cf_astigmatism_and_dispersion.c
* Program incorporates cf_x2lambda.
*
****************************************************************************/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "calfuse.h"
static char CF_PRGM_ID[] = "cf_dispersion";
static char CF_VER_NUM[] = "1.1";
int
cf_dispersion(fitsfile *infits, long nevents, float *x,
unsigned char *channel, float *lambda)
{
char wave_file[FLEN_VALUE];
float *wavelength=NULL;
float x_lower, x_upper, weight_l, weight_u, wave_l, wave_u;
int ap, errflg=0, nwave, xl_int, xu_int, status=0;
long k;
fitsfile *wavefits;
/* Enter a timestamp into the log. */
cf_error_init(CF_PRGM_ID, CF_VER_NUM, stderr);
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Begin Processing");
if ((errflg = cf_proc_check(infits, CF_PRGM_ID))) return errflg;
FITS_read_key(infits, TSTRING, "WAVE_CAL", wave_file, NULL, &status);
FITS_open_file(&wavefits, cf_cal_file(wave_file), READONLY, &status);
/* Cycle through channels, skipping #4 (pinhole) */
for (ap = 1; ap < 8; ap++) {
if (ap == 4) continue;
FITS_movabs_hdu(wavefits, ap+1, NULL, &status);
nwave = cf_read_col(wavefits, TFLOAT, "WAVELENGTH", (void **) &wavelength);
/* Compute wavelength for each event by interpolation. */
for (k = 0; k < nevents; k++) {
if (channel[k] == ap) {
x_lower = floor(x[k]);
x_upper = ceil(x[k]);
xl_int = (int) (x_lower + 0.5);
xu_int = (int) (x_upper + 0.5);
if (xl_int >= 0 && xu_int < nwave) {
if (xl_int == xu_int)
lambda[k] = wavelength[xl_int];
else {
weight_l = x_upper - x[k];
weight_u = x[k] - x_lower;
wave_l = wavelength[xl_int];
wave_u = wavelength[xu_int];
lambda[k] = wave_l * weight_l + wave_u * weight_u;
}
}
else
channel[k] = 0;
}
}
/* Space for wavelength array is allocated in each loop. */
free(wavelength);
}
FITS_close_file(wavefits, &status);
/* Update processing flags. */
cf_proc_update(infits, CF_PRGM_ID, "COMPLETE");
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done Processing");
return status;
}
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