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/* sum/gsl_sum.h
 *
 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Gerard Jungman, Brian Gough
 *
 * 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 3 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

/* Author:  G. Jungman */


#ifndef __GSL_SUM_H__
#define __GSL_SUM_H__

#include <stdlib.h>

#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS          /* empty */
# define __END_DECLS            /* empty */
#endif

__BEGIN_DECLS

/*  Workspace for Levin U Transform with error estimation,
 *   
 *   size        = number of terms the workspace can handle
 *   sum_plain   = simple sum of series
 *   q_num       = backward diagonal of numerator; length = size
 *   q_den       = backward diagonal of denominator; length = size
 *   dq_num      = table of numerator derivatives; length = size**2
 *   dq_den      = table of denominator derivatives; length = size**2
 *   dsum        = derivative of sum wrt term i; length = size
 */

typedef struct
{
  size_t size;
  size_t i;                     /* position in array */
  size_t terms_used;            /* number of calls */
  double sum_plain;
  double *q_num;
  double *q_den;
  double *dq_num;
  double *dq_den;
  double *dsum;
}