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/*===========================================================================
Copyright (C) 2001 European Southern Observatory (ESO)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 675 Massachusetss Ave, Cambridge,
MA 02139, USA.
Corresponding concerning ESO-MIDAS should be addressed as follows:
Internet e-mail: midas@eso.org
Postal address: European Southern Observatory
Data Management Division
Karl-Schwarzschild-Strasse 2
D 85748 Garching bei Muenchen
GERMANY
===========================================================================*/
/* Program : optsynth.c */
/* Author : G. Mulas - ITAL_FLAMES Consortium */
/* Date : */
/* */
/* Purpose : Missing */
/* */
/* */
/* Input: see interface */
/* */
/* Output: */
/* */
/* DRS Functions called: */
/* none */
/* */
/* Pseudocode: */
/* Missing */
/* */
/* Version : */
/* Last modification date: 2002/08/05 */
/* Who When Why Where */
/* AMo 02-08-05 Add header header */
/*-------------------------------------------------------------------------*/
/* C functions include files */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* MIDAS include files */
#include <flames_midas_def.h>
/* FLAMES-UVES include files */
#include <flames_optsynth.h>
#include <flames_uves.h>
#include <flames_newmatrix.h>
/**
@brief computes chi-2 to evaluate extraction quality
@param ScienceFrame input science frame
@param SingleFF single fibre FF
@param Order order table
@param backframe background frame
@param chisquare chi2 value
@param chisqpixels data points contributing to chi2 computation
@param nfittedparams number of fitted parameters
@doc
- initialise frame to inter-order background
- build fitted frame
- compute frame array as sum of good contributes
- computes chi2 as difference between frame array and frame background
divided by frame sigma.
*/
flames_err optsynth(flames_frame *ScienceFrame, allflats *SingleFF,
orderpos *Order, frame_data ***backframe,
double *chisquare, int *chisqpixels,
int *nfittedparams)
{
int32_t lastorder, ix, iy, lfibre, ifibre, iframe, iorder;
frame_data **framebuffer=0;
frame_mask **chisqmask=0;
frame_data chisqbuffer=0;
char output[160];
frame_data *fdvecbuf1=0;
frame_data *fdvecbuf2=0;
frame_data *fdvecbuf4=0;
frame_data *fdvecbuf5=0;
frame_mask *fmvecbuf1=0;
frame_mask *fmvecbuf2=0;
frame_mask *fmvecbuf3=0;
int32_t *lvecbuf1=0;
int32_t *lvecbuf2=0;
int32_t iyixindex=0;
int32_t iyixuplimit=0;
int32_t numorders=0;
int32_t ixiorderifibrestep=0;
int32_t iorderifibreindex=0;
int32_t iorderifibreixoffset=0;
int32_t ixiorderifibreindex=0;
int32_t iorderifibreixindex=0;
/* initialise output */
memset(output, 0, 160);
/* first, set the frame equal to the background (actually
just swap pointers) */
framebuffer = ScienceFrame->frame_array;
ScienceFrame->frame_array = *backframe;
*backframe = framebuffer;
/* Allocate and initialise the chisqmask */
chisqmask = fmmatrix(0, ScienceFrame->subrows-1, 0,
ScienceFrame->subcols-1);
fmvecbuf1 = chisqmask[0];
iyixuplimit = (ScienceFrame->subrows*ScienceFrame->subcols)-1;
for (iyixindex=0; iyixindex<=iyixuplimit; iyixindex++) {
fmvecbuf1[iyixindex] = 0;
}
/* initialise the diagnostics as well */
*chisquare = 0;
*chisqpixels = 0;
*nfittedparams = 0;
/* now, begin building the fitted frame */
lastorder = Order->lastorder-Order->firstorder;
numorders = lastorder+1;
ixiorderifibrestep = numorders*ScienceFrame->maxfibres;
fmvecbuf2 = ScienceFrame->specmask[0][0];
lvecbuf1 = SingleFF->lowfibrebounds[0][0];
lvecbuf2 = SingleFF->highfibrebounds[0][0];
fdvecbuf1 = ScienceFrame->frame_array[0];
fdvecbuf2 = ScienceFrame->spectrum[0][0];
fdvecbuf4 = (*backframe)[0];
fdvecbuf5 = ScienceFrame->frame_sigma[0];
fmvecbuf3 = ScienceFrame->badpixel[0];
for (lfibre=0; lfibre<=(ScienceFrame->num_lit_fibres-1); lfibre++) {
ifibre = ScienceFrame->ind_lit_fibres[lfibre];
iframe = SingleFF->fibre2frame[ifibre];
frame_data* fdvecbuf3 = SingleFF->flatdata[iframe].data[0];
for (iorder=0; iorder<=lastorder; iorder++) {
iorderifibreindex = (iorder*ScienceFrame->maxfibres)+ifibre;
iorderifibreixoffset = iorderifibreindex*ScienceFrame->subcols;
for (ix=0; ix<=(ScienceFrame->subcols-1); ix++) {
ixiorderifibreindex = (ix*ixiorderifibrestep)+iorderifibreindex;
iorderifibreixindex = iorderifibreixoffset+ix;
/* was this fibre extracted at this ix and iorder? */
if (fmvecbuf2[ixiorderifibreindex] == 1) {
/* yes, it was extracted, add its contribution */
/* since it was extracted, one more parameter was fitted */
(*nfittedparams)++;
for (iy=lvecbuf1[iorderifibreixindex];
iy<=lvecbuf2[iorderifibreixindex];
iy++) {
iyixindex = (iy*ScienceFrame->subcols)+ix;
fdvecbuf1[iyixindex] +=
fdvecbuf2[ixiorderifibreindex]*fdvecbuf3[iyixindex];
/* mark this pixel in the frame as a "fitted" one */
fmvecbuf1[iyixindex] = 1;
}
}
}
}
}
/* now compute the chisquare */
for (iyixindex=0; iyixindex<=iyixuplimit; iyixindex++) {
if ((fmvecbuf1[iyixindex]==1) && (fmvecbuf3[iyixindex]==0)) {
chisqbuffer = fdvecbuf1[iyixindex]-fdvecbuf4[iyixindex];
*chisquare += (double) (chisqbuffer*chisqbuffer/fdvecbuf5[iyixindex]);
(*chisqpixels)++;
}
}
/* speak about the results */
sprintf(output, "Measured Chi square %g on %d free parameters", *chisquare,
*chisqpixels-*nfittedparams);
SCTPUT(output);
sprintf(output, "resulting from %d used pixels and %d fitted params",
*chisqpixels, *nfittedparams);
SCTPUT(output);
/* free the locally allocated array */
free_fmmatrix(chisqmask, 0, ScienceFrame->subrows-1, 0,
ScienceFrame->subcols-1);
return NOERR;
}
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