RTOp_ROp_num_nonzeros.c

/*
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// Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
//                  Copyright (2003) Sandia Corporation
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#include "RTOp_ROp_num_nonzeros.h"
#include "RTOp_obj_null_vtbl.h"
#include "RTOp_obj_value_vtbl.h"
#include "RTOp_reduct_sum_value.h"

/* Note that the reduction quantity that we are accumulating (num_bounded) */
/* is an integral type and really should be delcared as RTOp_index_type. */
/* However, the machinary is already there for accumulating an RTOp_value_type */
/* reduction object so this implementation is just lazy and uses a double */
/* for an integer.  This should not slow things down very much and does */
/* not really waste any memory. */

/* Implementation functions */

static int RTOp_ROp_num_nonzeros_apply_op(
  const struct RTOp_RTOp_vtbl_t* vtbl, const void* obj_data
  , const int num_vecs, const struct RTOp_SubVector vecs[]
  , const int num_targ_vecs, const struct RTOp_MutableSubVector targ_vecs[]
  , RTOp_ReductTarget targ_obj )
{
  RTOp_index_type        v0_sub_dim;
  const RTOp_value_type  *v0_val;
  ptrdiff_t              v0_val_s;
  register RTOp_index_type k;
  RTOp_index_type          nz = 0;

  /* */
  /* Validate the input */
  /* */
  if( num_vecs != 1 )
    return RTOp_ERR_INVALID_NUM_VECS;
  assert( vecs );
  if( num_targ_vecs != 0 )
    return RTOp_ERR_INVALID_NUM_TARG_VECS;

  /* */
  /* Get pointers to data */
  /* */

  /* v0 */
  v0_sub_dim     = vecs[0].sub_dim;
  v0_val         = vecs[0].values;
  v0_val_s       = vecs[0].values_stride;

  /* */
  /* Count the number of nonzeros */
  /* */

  for( k = 0; k < v0_sub_dim; ++k, v0_val += v0_val_s )
    if(*v0_val != 0.0)
      ++nz;

  /* */
  /* Add this to the result */
  /* */
  *((RTOp_value_type*)targ_obj) += nz;

  return 0; /* success? */
}

/* Virtual function table */
const struct RTOp_RTOp_vtbl_t RTOp_ROp_num_nonzeros_vtbl =
{
  &RTOp_obj_null_vtbl   /* use null type for instance data */
  ,&RTOp_obj_value_vtbl /* use simple scalar type for target object */
  ,"ROp_num_nonzeros"
  ,NULL
  ,RTOp_ROp_num_nonzeros_apply_op
  ,RTOp_reduct_sum_value
  ,RTOp_get_reduct_sum_value_op
};

/* Class specific functions */

int RTOp_ROp_num_nonzeros_construct( struct RTOp_RTOp* op )
{
  op->obj_data = NULL;
  op->vtbl     = &RTOp_ROp_num_nonzeros_vtbl;
  return 0;
}

int RTOp_ROp_num_nonzeros_destroy( struct RTOp_RTOp* op )
{
  op->obj_data = NULL;
  op->vtbl     = NULL;
  return 0;
}

RTOp_index_type RTOp_ROp_num_nonzeros_val(RTOp_ReductTarget targ_obj)
{
  return (RTOp_index_type)*((RTOp_value_type*)targ_obj);
}