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/* $Id: fors_tools.c,v 1.1 2010-06-16 11:07:49 cizzo Exp $
*
* This file is part of the FORS Library
* Copyright (C) 2002-2006 European Southern Observatory
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* $Author: cizzo $
* $Date: 2010-06-16 11:07:49 $
* $Revision: 1.1 $
* $Name: not supported by cvs2svn $
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <fors_tools.h>
#include <cpl.h>
#include <math.h>
#include <stdbool.h>
#include <assert.h>
/*----------------------------------------------------------------------------*/
/**
* @defgroup fors_tools High level functions
*/
/*----------------------------------------------------------------------------*/
/**@{*/
/**
* @brief Compute average airmass
* @param header header to read from
* @return average airmass
*/
double
fors_get_airmass(const cpl_propertylist *header)
{
double airmass_start, airmass_end;
airmass_start = cpl_propertylist_get_double(header, "ESO TEL AIRM START");
if (cpl_error_get_code()) {
cpl_msg_error(cpl_func, "Could not read ESO TEL AIRM START from header");
return -1;
}
airmass_end = cpl_propertylist_get_double(header, "ESO TEL AIRM END");
if (cpl_error_get_code()) {
cpl_msg_error(cpl_func, "Could not read ESO TEL AIRM END from header");
return -1;
}
return 0.5 * (airmass_start + airmass_end);
}
/*----------------------------------------------------------------------------*/
/**
* @brief Same as cpl_tools_get_kth_double
*/
/*----------------------------------------------------------------------------*/
double fors_tools_get_kth_double(
double * a,
int n,
int k)
{
double x ;
int i, j, l, m ;
cpl_ensure(a, CPL_ERROR_NULL_INPUT, 0.00) ;
l=0 ; m=n-1 ;
while (l<m) {
x=a[k] ;
i=l ;
j=m ;
do {
while (a[i]<x) i++ ;
while (x<a[j]) j-- ;
if (i<=j) {
double temp = a[i];
a[i] = a[j];
a[j] = temp;
i++ ; j-- ;
}
} while (i<=j) ;
if (j<k) l=i ;
if (k<i) m=j ;
}
return a[k] ;
}
/**@}*/
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