AbstractLinAlgPack_SpVectorOp.cpp

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00003 // 
00004 // Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
00005 //                  Copyright (2003) Sandia Corporation
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00011 // it under the terms of the GNU Lesser General Public License as
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00028 
00029 #include "AbstractLinAlgPack_SpVectorOp.hpp"
00030 
00031 namespace {
00032 // Setup some template classes to check at complile time that
00033 // the layout of SpVectorSlice::element_type is proper.
00034 template<int N, class T>
00035 class assert_compile_time {
00036 public:
00037 assert_compile_time()
00038 {
00039   // This should not compile if instantiated with a type T that
00040   // is not an integer.  However, if the compiler checks this
00041   // function without instantiating it, it can not cause an error
00042   // because it does not know the type of T to see if the
00043   // conversion is legal or not.
00044   T d;
00045   static_cast<int*>(d);
00046 }
00047 };
00048 // Template specialization for no error
00049 template<>
00050 class assert_compile_time<0,double> {
00051 public:
00052 assert_compile_time()
00053 {}
00054 };
00055 // Validate that there is an integer stride between values
00056 assert_compile_time<
00057     ((int)sizeof(AbstractLinAlgPack::SpVectorSlice::element_type)
00058    % (int)sizeof(DenseLinAlgPack::value_type))
00059   , double
00060   >
00061     validate_value_stride;
00062 // Validate that there is an integer stride between indexes
00063 assert_compile_time<
00064     ((int)sizeof(AbstractLinAlgPack::SpVectorSlice::element_type)
00065    % (int)sizeof(DenseLinAlgPack::index_type))
00066   , double
00067   >
00068     validate_index_stride;
00069 } // end namespace
00070 
00071 void AbstractLinAlgPack::add_elements( SpVector* sv_lhs, value_type alpha, const DVectorSlice& vs_rhs
00072                    , size_type offset, bool add_zeros )
00073 {
00074   typedef SpVector::element_type ele_t;
00075   const bool assume_sorted = !sv_lhs->nz() || ( sv_lhs->nz() && sv_lhs->is_sorted() );
00076   DVectorSlice::const_iterator
00077     itr = vs_rhs.begin();
00078   if(add_zeros) {
00079     for( size_type i = 1; i <= vs_rhs.dim(); ++i )
00080       sv_lhs->add_element( ele_t( i + offset, alpha * (*itr++) ) );
00081   }
00082   else {
00083     for( size_type i = 1; i <= vs_rhs.dim(); ++i, ++itr )
00084       if( *itr != 0.0 )
00085         sv_lhs->add_element( ele_t( i + offset, alpha * (*itr) ) );
00086   }
00087   sv_lhs->assume_sorted(assume_sorted);
00088 }
00089 
00090 void AbstractLinAlgPack::add_elements( SpVector* sv_lhs, value_type alpha, const SpVectorSlice& sv_rhs
00091                    , size_type offset, bool add_zeros )
00092 {
00093   typedef SpVector::element_type ele_t;
00094   const bool assume_sorted = ( !sv_lhs->nz() || ( sv_lhs->nz() && sv_lhs->is_sorted() ) )
00095     && ( !sv_rhs.nz() || ( sv_rhs.nz() || sv_rhs.is_sorted() ) );
00096   if(add_zeros) {
00097     for( SpVectorSlice::const_iterator itr = sv_rhs.begin(); itr != sv_rhs.end(); ++itr )
00098       sv_lhs->add_element( ele_t( itr->index() + sv_rhs.offset() + offset, alpha * (itr->value()) ) );
00099   }
00100   else {
00101     for( SpVectorSlice::const_iterator itr = sv_rhs.begin(); itr != sv_rhs.end(); ++itr )
00102       if(itr->value() != 0.0 )
00103         sv_lhs->add_element( ele_t( itr->index() + sv_rhs.offset() + offset, alpha * (itr->value()) ) );
00104   }
00105   sv_lhs->assume_sorted(assume_sorted);
00106 }

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