text: /* matrix/oper_source.c
   * 
   * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 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.
   */
  
  int 
  FUNCTION(gsl_matrix, add) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
  
    if (b->size1 != M || b->size2 != N)
      {
        GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);
      }
    else 
      {
        const size_t tda_a = a->tda;
        const size_t tda_b = b->tda;
  
        size_t i, j;
  
        for (i = 0; i < M; i++)
          {
            for (j = 0; j < N; j++)
              {
                a->data[i * tda_a + j] += b->data[i * tda_b + j];
              }
          }
        
        return GSL_SUCCESS;
      }
  }
  
  int 
  FUNCTION(gsl_matrix, sub) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
  
    if (b->size1 != M || b->size2 != N)
      {
        GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);
      }
    else 
      {
        const size_t tda_a = a->tda;
        const size_t tda_b = b->tda;
  
        size_t i, j;
  
        for (i = 0; i < M; i++)
          {
            for (j = 0; j < N; j++)
              {
                a->data[i * tda_a + j] -= b->data[i * tda_b + j];
              }
          }
        
        return GSL_SUCCESS;
      }
  }
  
  int 
  FUNCTION(gsl_matrix, mul_elements) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
  
    if (b->size1 != M || b->size2 != N)
      {
        GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);
      }
    else 
      {
        const size_t tda_a = a->tda;
        const size_t tda_b = b->tda;
  
        size_t i, j;
  
        for (i = 0; i < M; i++)
          {
            for (j = 0; j < N; j++)
              {
                a->data[i * tda_a + j] *= b->data[i * tda_b + j];
              }
          }
        
        return GSL_SUCCESS;
      }
  }
  
  int 
  FUNCTION(gsl_matrix, div_elements) (TYPE(gsl_matrix) * a, const TYPE(gsl_matrix) * b)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
  
    if (b->size1 != M || b->size2 != N)
      {
        GSL_ERROR ("matrices must have same dimensions", GSL_EBADLEN);
      }
    else 
      {
        const size_t tda_a = a->tda;
        const size_t tda_b = b->tda;
  
        size_t i, j;
  
        for (i = 0; i < M; i++)
          {
            for (j = 0; j < N; j++)
              {
                a->data[i * tda_a + j] /= b->data[i * tda_b + j];
              }
          }
        
        return GSL_SUCCESS;
      }
  }
  
  int 
  FUNCTION(gsl_matrix, scale) (TYPE(gsl_matrix) * a, const double x)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
    const size_t tda = a->tda;
    
    size_t i, j;
    
    for (i = 0; i < M; i++)
      {
        for (j = 0; j < N; j++)
          {
            a->data[i * tda + j] *= x;
          }
      }
    
    return GSL_SUCCESS;
  }
  
  int 
  FUNCTION(gsl_matrix, add_constant) (TYPE(gsl_matrix) * a, const double x)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
    const size_t tda = a->tda;
  
    size_t i, j;
  
    for (i = 0; i < M; i++)
      {
        for (j = 0; j < N; j++)
          {
            a->data[i * tda + j] += x;
          }
      }
    
    return GSL_SUCCESS;
  }
  
  
  int 
  FUNCTION(gsl_matrix, add_diagonal) (TYPE(gsl_matrix) * a, const double x)
  {
    const size_t M = a->size1;
    const size_t N = a->size2;
    const size_t tda = a->tda;
    const size_t loop_lim = ( M < N ? M : N );
    size_t i;
    for (i = 0; i < loop_lim; i++)
    {
      a->data[i * tda + i] += x;
    }
  
    return GSL_SUCCESS;
  }
  