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Img_ss.c
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Img_ss.c
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/* Copyright (c) 2014, Giuseppe Argentieri <giuseppe.argentieri@ts.infn.it>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* =====================================================================================
*
* Filename: Img_ss.c
*
* Description:
*
* Version: 1.0
* Created: 15/04/2013 16:44:51
* Revision: none
* Compiler: gcc
*
* Author: Giuseppe Argentieri (), argenti@ts.infn.it
* Organization:
*
* =====================================================================================
*/
#include "funcs.h"
/* #include <gsl/gsl_sf_expint.h> */
int im_gss ( void* params, double* val, double* error )
{
struct f_params* pars = (struct f_params*) params ;
double o_c, b, O, o_1, alpha ;
assign_p ( pars, &o_c, &b, &O, &o_1 ) ;
alpha = pars->alpha ;
double e1, e2, E1, E2 ;
double err1, err2, ERR1, ERR2 ;
double beta1 = O + o_1 ;
double beta2 = o_1 - O ;
double mu = 1/o_c ;
expi ( beta1*mu, &e1, &err1 ) ;
expi_plus ( beta1*mu, &E1, &ERR1 ) ;
expi_plus ( beta2*mu, &E2, &ERR2 ) ;
expi ( beta2*mu, &e2, &err2 ) ;
/* e1 = - gsl_sf_expint_E1 ( beta1*mu ) ;
* e2 = - gsl_sf_expint_E1 ( beta2*mu ) ;
* E1 = gsl_sf_expint_Ei ( beta1*mu ) ;
* E2 = gsl_sf_expint_Ei ( beta2*mu ) ;
*/
double imgss = (alpha/4)*(beta1*(e1*exp(beta1*mu)-E1*exp(-beta1*mu)) +
beta2*(E2*exp(-beta2*mu)-e2*exp(beta2*mu))) ;
*val = imgss ;
double err = (alpha/4)*(beta1*(err1*exp(beta1*mu))+ERR1*exp(-beta1*mu) +
beta2*(ERR2*exp(-beta2*mu)+err2*exp(beta2*mu))) ;
*error = err ;
return 0;
}