RTOp_ROp_num_nonzeros.c

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00001 /*
00002 // @HEADER
00003 // ***********************************************************************
00004 // 
00005 // Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
00006 //                  Copyright (2003) Sandia Corporation
00007 // 
00008 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00009 // license for use of this work by or on behalf of the U.S. Government.
00010 // 
00011 // This library is free software; you can redistribute it and/or modify
00012 // it under the terms of the GNU Lesser General Public License as
00013 // published by the Free Software Foundation; either version 2.1 of the
00014 // License, or (at your option) any later version.
00015 //  
00016 // This library is distributed in the hope that it will be useful, but
00017 // WITHOUT ANY WARRANTY; without even the implied warranty of
00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00019 // Lesser General Public License for more details.
00020 //  
00021 // You should have received a copy of the GNU Lesser General Public
00022 // License along with this library; if not, write to the Free Software
00023 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00024 // USA
00025 // Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
00026 // 
00027 // ***********************************************************************
00028 // @HEADER
00029 */
00030 
00031 #include "RTOp_ROp_num_nonzeros.h"
00032 #include "RTOp_obj_null_vtbl.h"
00033 #include "RTOp_obj_value_vtbl.h"
00034 #include "RTOp_reduct_sum_value.h"
00035 
00036 /* Note that the reduction quantity that we are accumulating (num_bounded) */
00037 /* is an integral type and really should be delcared as RTOp_index_type. */
00038 /* However, the machinary is already there for accumulating an RTOp_value_type */
00039 /* reduction object so this implementation is just lazy and uses a double */
00040 /* for an integer.  This should not slow things down very much and does */
00041 /* not really waste any memory. */
00042 
00043 /* Implementation functions */
00044 
00045 static int RTOp_ROp_num_nonzeros_apply_op(
00046   const struct RTOp_RTOp_vtbl_t* vtbl, const void* obj_data
00047   , const int num_vecs, const struct RTOp_SubVector vecs[]
00048   , const int num_targ_vecs, const struct RTOp_MutableSubVector targ_vecs[]
00049   , RTOp_ReductTarget targ_obj )
00050 {
00051   RTOp_index_type        v0_sub_dim;
00052   const RTOp_value_type  *v0_val;
00053   ptrdiff_t              v0_val_s;
00054   register RTOp_index_type k;
00055   RTOp_index_type          nz = 0;
00056 
00057   /* */
00058   /* Validate the input */
00059   /* */
00060   if( num_vecs != 1 )
00061     return RTOp_ERR_INVALID_NUM_VECS;
00062   assert( vecs );
00063   if( num_targ_vecs != 0 )
00064     return RTOp_ERR_INVALID_NUM_TARG_VECS;
00065 
00066   /* */
00067   /* Get pointers to data */
00068   /* */
00069 
00070   /* v0 */
00071   v0_sub_dim     = vecs[0].sub_dim;
00072   v0_val         = vecs[0].values;
00073   v0_val_s       = vecs[0].values_stride;
00074 
00075   /* */
00076   /* Count the number of nonzeros */
00077   /* */
00078 
00079   for( k = 0; k < v0_sub_dim; ++k, v0_val += v0_val_s )
00080     if(*v0_val != 0.0)
00081       ++nz;
00082 
00083   /* */
00084   /* Add this to the result */
00085   /* */
00086   *((RTOp_value_type*)targ_obj) += nz;
00087 
00088   return 0; /* success? */
00089 }
00090 
00091 /* Virtual function table */
00092 const struct RTOp_RTOp_vtbl_t RTOp_ROp_num_nonzeros_vtbl =
00093 {
00094   &RTOp_obj_null_vtbl   /* use null type for instance data */
00095   ,&RTOp_obj_value_vtbl /* use simple scalar type for target object */
00096   ,"ROp_num_nonzeros"
00097   ,NULL
00098   ,RTOp_ROp_num_nonzeros_apply_op
00099   ,RTOp_reduct_sum_value
00100   ,RTOp_get_reduct_sum_value_op
00101 };
00102 
00103 /* Class specific functions */
00104 
00105 int RTOp_ROp_num_nonzeros_construct( struct RTOp_RTOp* op )
00106 {
00107   op->obj_data = NULL;
00108   op->vtbl     = &RTOp_ROp_num_nonzeros_vtbl;
00109   return 0;
00110 }
00111 
00112 int RTOp_ROp_num_nonzeros_destroy( struct RTOp_RTOp* op )
00113 {
00114   op->obj_data = NULL;
00115   op->vtbl     = NULL;
00116   return 0;
00117 }
00118 
00119 RTOp_index_type RTOp_ROp_num_nonzeros_val(RTOp_ReductTarget targ_obj)
00120 {
00121   return (RTOp_index_type)*((RTOp_value_type*)targ_obj);
00122 }

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