makeit.c

/*
*				makeit.c
*
* Main program.
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
*
*	This file part of:	SExtractor
*
*	Copyright:		(C) 1993-2020 IAP/CNRS/SorbonneU
*
*	License:		GNU General Public License
*
*	SExtractor 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 3 of the License, or
*	(at your option) any later version.
*	SExtractor 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 SExtractor. If not, see <http://www.gnu.org/licenses/>.
*
*	Last modified:		15/07/2020
*
*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifdef HAVE_CONFIG_H
#include        "config.h"
#endif

#include	<math.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<string.h>
#include	<time.h>

#include	"define.h"
#include	"globals.h"
#include	"prefs.h"
#include	"fits/fitscat.h"
#include	"assoc.h"
#include	"back.h"
#include	"check.h"
#include	"fft.h"
#include	"field.h"
#include	"filter.h"
#include	"growth.h"
#include	"interpolate.h"
#include	"pattern.h"
#include	"psf.h"
#include	"profit.h"
#include	"som.h"
#include	"weight.h"
#include	"xml.h"

static int		selectext(char *filename);

time_t			thetimet, thetimet2;
#ifdef USE_MODEL
extern profitstruct	*theprofit,*thedprofit, *thepprofit,*theqprofit;
#else
profitstruct		*theprofit,*thedprofit, *thepprofit,*theqprofit;
#endif
extern char		profname[][32];
extern float		ctg[37], stg[37];

sexcatstruct		thecat;
picstruct		thefield1,thefield2, thewfield1,thewfield2;
char			gstr[MAXCHAR];


/******************************** makeit *************************************/
/*
Manage the whole stuff.
*/
void	makeit()

  {
   checkstruct		*check;
   picstruct		*dfield, *field,*pffield[MAXFLAG], *wfield,*dwfield,
			*dgeofield;
   catstruct		*imacat;
   tabstruct		*imatab;
   patternstruct	*pattern;
   static time_t        thetime1, thetime2;
   struct tm		*tm;
   double		dtime;
   unsigned int		modeltype;
   int			nflag[MAXFLAG], nparam2[2],
			i, nok, ntab, next, ntabmax, forcextflag,
			nima0,nima1, nweight0,nweight1, npsf0,npsf1, npat,npat0,
			ndgeo;

/* Install error logging */
  error_installfunc(write_error);

/* Processing start date and time */
  dtime = counter_seconds();
  thetimet = time(NULL);
  tm = localtime(&thetimet);
  sprintf(prefs.sdate_start,"%04d-%02d-%02d",
        tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday);
  sprintf(prefs.stime_start,"%02d:%02d:%02d",
        tm->tm_hour, tm->tm_min, tm->tm_sec);

  NFPRINTF(OUTPUT, "");
  QPRINTF(OUTPUT, "----- %s %s started on %s at %s with %d thread%s\n\n",
		BANNER,
		MYVERSION,
		prefs.sdate_start,
		prefs.stime_start,
		prefs.nthreads,
		prefs.nthreads>1? "s":"");

/* Initialize globals variables */
  initglob();

  NFPRINTF(OUTPUT, "Setting catalog parameters");
  readcatparams(prefs.param_name);
  useprefs();			/* update things accor. to prefs parameters */

/* Check if a specific extension should be loaded */
  if ((nima0=selectext(prefs.image_name[0])) != RETURN_ERROR)
    {
    forcextflag = 1;
    ntabmax = next = 1;
    }
  else
    forcextflag = 0;

/* Do the same for other data (but do not force single extension mode) */
  nima1 = selectext(prefs.image_name[1]);
  nweight0 = selectext(prefs.wimage_name[0]);
  nweight1 = selectext(prefs.wimage_name[1]);
  if (prefs.dpsf_flag)
    {
    npsf0 = selectext(prefs.psf_name[0]);
    npsf1 = selectext(prefs.psf_name[1]);
    }
  else
    npsf0 = selectext(prefs.psf_name[0]);
  for (i=0; i<prefs.nfimage_name; i++)
    nflag[i] = selectext(prefs.fimage_name[i]);
  ndgeo = selectext(prefs.dgeoimage_name);

  if (prefs.psf_flag)
    {
/*-- Read the first PSF extension to set up stuff such as context parameters */
    NFPRINTF(OUTPUT, "Reading PSF information");
    if (prefs.dpsf_flag)
      {
      thedpsf = psf_load(prefs.psf_name[0],nima0<0? 1 :(npsf0<0? 1:npsf0)); 
      thepsf = psf_load(prefs.psf_name[1], nima1<0? 1 :(npsf1<0? 1:npsf1));
      }
    else
      thepsf = psf_load(prefs.psf_name[0], nima0<0? 1 :(npsf0<0? 1:npsf0)); 
 /*-- Need to check things up because of PSF context parameters */
    updateparamflags();
    useprefs();
    }

  if (prefs.prof_flag)
    {
#ifdef USE_MODEL
    fft_init(prefs.nthreads);
/* Create profiles at full resolution */
    NFPRINTF(OUTPUT, "Preparing profile models");
    modeltype = (FLAG(obj2.prof_offset_flux)? MODEL_BACK : MODEL_NONE)
	|(FLAG(obj2.prof_dirac_flux)? MODEL_DIRAC : MODEL_NONE)
	|(FLAG(obj2.prof_spheroid_flux)?
		(FLAG(obj2.prof_spheroid_sersicn)?
			MODEL_SERSIC : MODEL_DEVAUCOULEURS) : MODEL_NONE)
	|(FLAG(obj2.prof_disk_flux)? MODEL_EXPONENTIAL : MODEL_NONE)
	|(FLAG(obj2.prof_bar_flux)? MODEL_BAR : MODEL_NONE)
	|(FLAG(obj2.prof_arms_flux)? MODEL_ARMS : MODEL_NONE);
    theprofit = profit_init(thepsf, modeltype);
    changecatparamarrays("VECTOR_MODEL", &theprofit->nparam, 1);
    changecatparamarrays("VECTOR_MODELERR", &theprofit->nparam, 1);
    nparam2[0] = nparam2[1] = theprofit->nparam;
    changecatparamarrays("MATRIX_MODELERR", nparam2, 2);
    if (prefs.dprof_flag)
      thedprofit = profit_init(thedpsf, modeltype);
    if (prefs.pattern_flag)
      {
      npat0 = prefs.prof_disk_patternvectorsize;
      if (npat0<prefs.prof_disk_patternmodvectorsize)
        npat0 = prefs.prof_disk_patternmodvectorsize;
      if (npat0<prefs.prof_disk_patternargvectorsize)
        npat0 = prefs.prof_disk_patternargvectorsize;
/*---- Do a copy of the original number of pattern components */
      prefs.prof_disk_patternncomp = npat0;
      pattern = pattern_init(theprofit, prefs.pattern_type, npat0);
      if (FLAG(obj2.prof_disk_patternvector))
        {
        npat = pattern->size[2];
        changecatparamarrays("DISK_PATTERN_VECTOR", &npat, 1);
        }
      if (FLAG(obj2.prof_disk_patternmodvector))
        {
        npat = pattern->ncomp*pattern->nfreq;
        changecatparamarrays("DISK_PATTERNMOD_VECTOR", &npat, 1);
        }
      if (FLAG(obj2.prof_disk_patternargvector))
        {
        npat = pattern->ncomp*pattern->nfreq;
        changecatparamarrays("DISK_PATTERNARG_VECTOR", &npat, 1);
        }
      pattern_end(pattern);
      }
    QPRINTF(OUTPUT, "Fitting model: ");
    for (i=0; i<theprofit->nprof; i++)
      {
      if (i)
        QPRINTF(OUTPUT, "+");
      QPRINTF(OUTPUT, "%s", theprofit->prof[i]->name);
      }
    QPRINTF(OUTPUT, "\n");
    if (FLAG(obj2.prof_concentration)|FLAG(obj2.prof_concentration))
      {
      thepprofit = profit_init(thepsf, MODEL_DIRAC);
      theqprofit = profit_init(thepsf, MODEL_EXPONENTIAL);
      }
#else
    error(EXIT_FAILURE,
		"*Error*: model-fitting is not supported in this build.\n",
			" Please check your configure options");
#endif
    }

  if (prefs.filter_flag)
    {
    NFPRINTF(OUTPUT, "Reading detection filter");
    getfilter(prefs.filter_name);	/* get the detection filter */
    }

  if (FLAG(obj2.sprob))
    {
    NFPRINTF(OUTPUT, "Initializing Neural Network");
    neurinit();
    NFPRINTF(OUTPUT, "Reading Neural Network Weights");
    getnnw(); 
    }

  if (prefs.somfit_flag)
    {
     int	margin;

    thesom = som_load(prefs.som_name);
    if ((margin=(thesom->inputsize[1]+1)/2) > prefs.cleanmargin)
      prefs.cleanmargin = margin;
    if (prefs.somfit_vectorsize>thesom->neurdim)
      {
      prefs.somfit_vectorsize = thesom->neurdim;
      sprintf(gstr,"%d", prefs.somfit_vectorsize);
      warning("Dimensionality of the SOM-fit vector limited to ", gstr);
      }
    }

/* Prepare growth-curve buffer */
  if (prefs.growth_flag)
    initgrowth();

/* Allocate memory for multidimensional catalog parameter arrays */
  alloccatparams();
  useprefs();

  if (!(imacat = read_cat(prefs.image_name[0])))
    error(EXIT_FAILURE, "*Error*: cannot open ", prefs.image_name[0]);
  close_cat(imacat);
  imatab = imacat->tab;

  if (!forcextflag)
    {
    ntabmax = imacat->ntab;
/*-- Compute the number of valid input extensions */
    next = 0;
    for (ntab = 0 ; ntab<imacat->ntab; ntab++, imatab = imatab->nexttab)
      {
/*---- Check for the next valid image extension */
      if ((imatab->naxis < 2)
	|| !strncmp(imatab->xtension, "BINTABLE", 8)
	|| !strncmp(imatab->xtension, "ASCTABLE", 8))
    	  if (!imatab->isTileCompressed)
        continue;
      next++;
      }
    }

  thecat.next = next;

/*-- Init the CHECK-images */
  if (prefs.check_flag)
    {
     checkenum	c;

    NFPRINTF(OUTPUT, "Initializing check-image(s)");
    for (i=0; i<prefs.ncheck_type; i++)
      if ((c=prefs.check_type[i]) != CHECK_NONE)
        {
        if (prefs.check[c])
           error(EXIT_FAILURE,"*Error*: 2 CHECK_IMAGEs cannot have the same ",
			" CHECK_IMAGE_TYPE");
        prefs.check[c] = initcheck(prefs.check_name[i], prefs.check_type[i],
			next);
        }
    }

  NFPRINTF(OUTPUT, "Initializing catalog");
  initcat();

/* Initialize XML data */
  if (prefs.xml_flag || prefs.cat_type==ASCII_VO)
    init_xml(next);

/* Go through all images */
  nok = 0;
  for (ntab = 0 ; ntab<ntabmax; ntab++, imatab = imatab->nexttab)
    {
/*--  Check for the next valid image extension */
    if (!forcextflag && ((imatab->naxis < 2)
	|| !strncmp(imatab->xtension, "BINTABLE", 8)
	|| !strncmp(imatab->xtension, "ASCTABLE", 8)))
if (!imatab->isTileCompressed)
      continue;

    nok++;

/*-- Initial time measurement*/
    time(&thetime1);
    thecat.currext = nok;

    dfield = field = wfield = dwfield = dgeofield = NULL;

    if (prefs.dimage_flag)
      {
/*---- Init the Detection and Measurement-images */
      dfield = newfield(prefs.image_name[0], DETECT_FIELD,
	nima0<0? ntab:nima0);
      field = newfield(prefs.image_name[1], MEASURE_FIELD,
	nima1<0? ntab:nima1);
      if ((field->width!=dfield->width) || (field->height!=dfield->height))
        error(EXIT_FAILURE, "*Error*: Frames have different sizes","");
/*---- Prepare interpolation */
      if (prefs.dweight_flag && prefs.interp_type[0] == INTERP_ALL)
        init_interpolate(dfield, -1, -1);
      if (prefs.interp_type[1] == INTERP_ALL)
        init_interpolate(field, -1, -1);
      }
    else
      {
      field = newfield(prefs.image_name[0], DETECT_FIELD | MEASURE_FIELD,
		nima0<0? ntab:nima0);

/*---- Prepare interpolation */
      if ((prefs.dweight_flag || prefs.weight_flag)
	&& prefs.interp_type[0] == INTERP_ALL)
      init_interpolate(field, -1, -1);       /* 0.0 or anything else */
      }

/*-- Init the WEIGHT-images */
    if (prefs.dweight_flag || prefs.weight_flag) 
      {
       weightenum	wtype;
       PIXTYPE	interpthresh;

      if (prefs.nweight_type>1)
        {
/*------ Double-weight-map mode */
        if (prefs.weight_type[1] != WEIGHT_NONE)
          {
/*-------- First: the "measurement" weights */
          wfield = newweight(prefs.wimage_name[1],field,prefs.weight_type[1],
		(nima1<0 && prefs.image_name[1])?
			ntab : (nweight1<0?1:nweight1));
          wtype = prefs.weight_type[1];
          interpthresh = prefs.weight_thresh[1];
/*-------- Convert the interpolation threshold to variance units */
          weight_to_var(wfield, &interpthresh, 1);
          wfield->weight_thresh = interpthresh;
          if (prefs.interp_type[1] != INTERP_NONE)
            init_interpolate(wfield,
		prefs.interp_xtimeout[1], prefs.interp_ytimeout[1]);
          }
/*------ The "detection" weights */
        if (prefs.weight_type[0] != WEIGHT_NONE)
          {
          interpthresh = prefs.weight_thresh[0];
          if (prefs.weight_type[0] == WEIGHT_FROMINTERP)
            {
            dwfield=newweight(prefs.wimage_name[0],wfield,prefs.weight_type[0],
		nima0<0? ntab : (nweight0<0? 1 :nweight0));
            weight_to_var(wfield, &interpthresh, 1);
            }
          else
            {
            dwfield = newweight(prefs.wimage_name[0], dfield?dfield:field,
		prefs.weight_type[0], nima0<0? ntab : (nweight0<0?1:nweight0));
            weight_to_var(dwfield, &interpthresh, 1);
            }
          dwfield->weight_thresh = interpthresh;
          if (prefs.interp_type[0] != INTERP_NONE)
            init_interpolate(dwfield,
		prefs.interp_xtimeout[0], prefs.interp_ytimeout[0]);
          }
        }
      else
        {
/*------ Single-weight-map mode */
        wfield = newweight(prefs.wimage_name[0], dfield?dfield:field,
		prefs.weight_type[0], nima0<0? ntab : (nweight0<0?1:nweight0));
        wtype = prefs.weight_type[0];
        interpthresh = prefs.weight_thresh[0];
/*------ Convert the interpolation threshold to variance units */
        weight_to_var(wfield, &interpthresh, 1);
        wfield->weight_thresh = interpthresh;
        if (prefs.interp_type[0] != INTERP_NONE)
          init_interpolate(wfield,
		prefs.interp_xtimeout[0], prefs.interp_ytimeout[0]);
        }
      }

/*-- Init the FLAG-images */
    for (i=0; i<prefs.nimaflag; i++)
      {
      pffield[i] = newfield(prefs.fimage_name[i], FLAG_FIELD,
		nima0<0? ntab : (nflag[i]<0?1:nflag[i]));
      if ((pffield[i]->width!=field->width)
	|| (pffield[i]->height!=field->height))
        error(EXIT_FAILURE,
	"*Error*: Incompatible FLAG-map size in ", prefs.fimage_name[i]);
      }

/*-- Init the differential geometry images */
    if (prefs.dgeo_type != DGEO_NONE) {
      dgeofield = newfield(prefs.dgeoimage_name, DGEO_FIELD,
		nima0<0? ntab : (ndgeo<0?1:ndgeo));
      if ((dgeofield->width != field->width)
		|| (dgeofield->height != field->height))
        error(EXIT_FAILURE,
		"*Error*: Incompatible differential geometry map size in ",
		prefs.dgeoimage_name);
    }


/*-- Compute background maps for `standard' fields */
    QPRINTF(OUTPUT, dfield? "Measurement image:"
			: "Detection+Measurement image: ");
    makeback(field, wfield, prefs.wscale_flag[1]);
    QPRINTF(OUTPUT, (dfield || (dwfield&&dwfield->flags^INTERP_FIELD))? "(M)   "
		"Background: %-10g RMS: %-10g / Threshold: %-10g \n"
		: "(M+D) "
		"Background: %-10g RMS: %-10g / Threshold: %-10g \n",
	field->backmean, field->backsig, (field->flags & DETECT_FIELD)?
	field->dthresh: field->thresh);
    if (dfield)
      {
      QPRINTF(OUTPUT, "Detection image: ");
      makeback(dfield, dwfield? dwfield
			: (prefs.weight_type[0] == WEIGHT_NONE?NULL:wfield),
		prefs.wscale_flag[0]);
      QPRINTF(OUTPUT, "(D)   "
		"Background: %-10g RMS: %-10g / Threshold: %-10g \n",
	dfield->backmean, dfield->backsig, dfield->dthresh);
      }
    else if (dwfield && dwfield->flags^INTERP_FIELD)
      {
      makeback(field, dwfield, prefs.wscale_flag[0]);
      QPRINTF(OUTPUT, "(D)   "
		"Background: %-10g RMS: %-10g / Threshold: %-10g \n",
	field->backmean, field->backsig, field->dthresh);
      }

/*-- For interpolated weight-maps, copy the background structure */
    if (dwfield && dwfield->flags&(INTERP_FIELD|BACKRMS_FIELD))
      copyback(dwfield->reffield, dwfield);
    if (wfield && wfield->flags&(INTERP_FIELD|BACKRMS_FIELD))
      copyback(wfield->reffield, wfield);

/*-- Prepare learn and/or associations */
    if (prefs.assoc_flag)
      init_assoc(field);                  /* initialize assoc tasks */

/*-- Update the CHECK-images */
    if (prefs.check_flag)
      for (i=0; i<MAXCHECK; i++)
        if ((check=prefs.check[i]))
          reinitcheck(field, check);

    if (!forcextflag && nok>1)
      {
      if (prefs.psf_flag)
        {
/*------ Read other PSF extensions */
        NFPRINTF(OUTPUT, "Reading PSF information");
        psf_end(thepsf, thepsfit);
        if (prefs.dpsf_flag)
          {
          psf_end(thedpsf, thedpsfit);
          thedpsf = psf_load(prefs.psf_name[0], nok);
          thepsf = psf_load(prefs.psf_name[1], nok);
          }
        else
          thepsf = psf_load(prefs.psf_name[0], nok); 
        }

#ifdef USE_MODEL
      if (prefs.prof_flag)
        {
/*------ Create profiles at full resolution */
        profit_end(theprofit);
        theprofit = profit_init(thepsf, modeltype);
        if (prefs.dprof_flag)
          {
          profit_end(thedprofit);
          thedprofit = profit_init(thedpsf, modeltype);
          }
        if (prefs.pattern_flag)
          {
          pattern = pattern_init(theprofit, prefs.pattern_type, npat0);
          pattern_end(pattern);
          }
        if (FLAG(obj2.prof_concentration)|FLAG(obj2.prof_concentration))
          {
          profit_end(thepprofit);
          profit_end(theqprofit);
          thepprofit = profit_init(thepsf, MODEL_DIRAC);
          theqprofit = profit_init(thepsf, MODEL_EXPONENTIAL);
          }
        }
#endif
      }

/*-- Initialize PSF contexts and workspace */
    if (prefs.psf_flag)
      {
      psf_readcontext(thepsf, field);
      psf_init();
      if (prefs.dpsf_flag)
        {
        psf_readcontext(thepsf, dfield);
        psf_init();
        }
      }

/*-- Copy field structures to static ones (for catalog info) */
    if (dfield)
      {
      thefield1 = *field;
      thefield2 = *dfield;
      }
    else
      thefield1 = thefield2 = *field;

    if (wfield)
      {
      thewfield1 = *wfield;
      thewfield2 = dwfield? *dwfield: *wfield;
      }
    else if (dwfield)
      thewfield2 = *dwfield;

    reinitcat(field);

/*-- Start the extraction pipeline */
    NFPRINTF(OUTPUT, "Scanning image");
    scanimage(field, dfield, pffield, prefs.nimaflag, wfield, dwfield,
		dgeofield);

/*-- Finish the current CHECK-image processing */
    if (prefs.check_flag)
      for (i=0; i<MAXCHECK; i++)
        if ((check=prefs.check[i]))
          reendcheck(field, check);

/*-- Final time measurements*/
    if (time(&thetime2)!=-1)
      {
      if (!strftime(thecat.ext_date, 12, "%d/%m/%Y", localtime(&thetime2)))
        error(EXIT_FAILURE, "*Internal Error*: Date string too long ","");
      if (!strftime(thecat.ext_time, 10, "%H:%M:%S", localtime(&thetime2)))
        error(EXIT_FAILURE, "*Internal Error*: Time/date string too long ","");
      thecat.ext_elapsed = difftime(thetime2, thetime1);
      }

    reendcat();

/* Update XML data */
    if (prefs.xml_flag || prefs.cat_type==ASCII_VO)
      update_xml(&thecat, dfield? dfield:field, field,
	dwfield? dwfield:wfield, wfield);


/*-- Close ASSOC routines */
    end_assoc(field);

    for (i=0; i<prefs.nimaflag; i++)
      endfield(pffield[i]);
    endfield(field);
    if (dfield)
      endfield(dfield);
    if (wfield)
      endfield(wfield);
    if (dwfield)
      endfield(dwfield);
    if (dgeofield)
      endfield(dgeofield);

    QPRINTF(OUTPUT, "      Objects: detected %-8d / sextracted %-8d        \n\n",
	thecat.ndetect, thecat.ntotal);
    }

  if (nok<=0)
    error(EXIT_FAILURE, "Not enough valid FITS image extensions in ",
	prefs.image_name[0]);
  free_cat(&imacat, 1);

  NFPRINTF(OUTPUT, "Closing files");

/* End CHECK-image processing */
  if (prefs.check_flag)
    for (i=0; i<MAXCHECK; i++)
      {
      if ((check=prefs.check[i]))
        endcheck(check);
      prefs.check[i] = NULL;
      }

  if (prefs.filter_flag)
    endfilter();

  if (prefs.somfit_flag)
    som_end(thesom);

  if (prefs.growth_flag)
    endgrowth();

#ifdef USE_MODEL
  if (prefs.prof_flag)
    {
    profit_end(theprofit);
    if (prefs.dprof_flag)
      profit_end(thedprofit);
    if (FLAG(obj2.prof_concentration)|FLAG(obj2.prof_concentration))
      {
      profit_end(thepprofit);
      profit_end(theqprofit);
      }
    fft_end();
    }
#endif

  if (prefs.psf_flag)
    psf_end(thepsf, thepsfit);

  if (prefs.dpsf_flag)
    psf_end(thedpsf, thedpsfit);

  if (FLAG(obj2.sprob))
    neurclose();

/* Processing end date and time */
  thetimet2 = time(NULL);
  tm = localtime(&thetimet2);
  sprintf(prefs.sdate_end,"%04d-%02d-%02d",
	tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday);
  sprintf(prefs.stime_end,"%02d:%02d:%02d",
	tm->tm_hour, tm->tm_min, tm->tm_sec);
  prefs.time_diff = counter_seconds() - dtime;

/* Write XML */
  if (prefs.xml_flag)
    write_xml(prefs.xml_name);

  endcat((char *)NULL);

  if (prefs.xml_flag || prefs.cat_type==ASCII_VO)
    end_xml();

  return;
  }


/******************************** initglob ***********************************/
/*
Initialize a few global variables
*/
void	initglob()
  {
   int	i;

  for (i=0; i<37; i++)
    {
    ctg[i] = cos(i*PI/18);
    stg[i] = sin(i*PI/18);
    }


  return;
  }


/****** selectext ************************************************************
PROTO	int selectext(char *filename)
PURPOSE	Return the user-selected extension number [%d] from the file name.
INPUT	Filename character string.
OUTPUT	Extension number, or RETURN_ERROR if nos extension specified.
NOTES	The bracket and its extension number are removed from the filename if
	found.
AUTHOR  E. Bertin (IAP)
VERSION 08/10/2007
 ***/
static int	selectext(char *filename)
  {
   char	*bracl,*bracr;
   int	next;

  if (filename && (bracl=strrchr(filename, '[')))
    {
    *bracl = '\0';
    if ((bracr=strrchr(bracl+1, ']')))
      *bracr = '\0';
    next = strtol(bracl+1, NULL, 0);

    // VERY BAD HACK to check if this is tile-compressed, if so, add +1 to extension number requested
    if (strstr(filename, ".fits.fz") != NULL) next = next + 1;

    return next;
    }

  return RETURN_ERROR;
  }


/****** write_error ********************************************************
PROTO	int	write_error(char *msg1, char *msg2)
PURPOSE	Manage files in case of a catched error
INPUT	a character string,
	another character string
OUTPUT	RETURN_OK if everything went fine, RETURN_ERROR otherwise.
NOTES	-.
AUTHOR	E. Bertin (IAP)
VERSION	14/07/2006
 ***/
void	write_error(char *msg1, char *msg2)
  {
   char			error[MAXCHAR];

  sprintf(error, "%s%s", msg1,msg2);
  if (prefs.xml_flag)
    write_xmlerror(prefs.xml_name, error);

/* Also close existing catalog */
  endcat(error);

  end_xml();

  return;
  }