nullary_indexing.cpp File Reference

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Functions
int	main ()
template<class ArgType , class RowIndexType , class ColIndexType >
Eigen::CwiseNullaryOp< indexing_functor< ArgType, RowIndexType, ColIndexType >, typename indexing_functor< ArgType, RowIndexType, ColIndexType >::MatrixType >	mat_indexing (const Eigen::MatrixBase< ArgType > &arg, const RowIndexType &row_indices, const ColIndexType &col_indices)

Function Documentation

main()

int main

(

)

Definition at line 40 of file nullary_indexing.cpp.

{
  std::cout << "[main1]\n";
  Eigen::MatrixXi A = Eigen::MatrixXi::Random(4,4);
  Eigen::Array3i ri(1,2,1);
  Eigen::ArrayXi ci(6); ci << 3,2,1,0,0,2;
  Eigen::MatrixXi B = mat_indexing(A, ri, ci);
  std::cout << "A =" << std::endl;
  std::cout << A << std::endl << std::endl;
  std::cout << "A([" << ri.transpose() << "], [" << ci.transpose() << "]) =" << std::endl;
  std::cout << B << std::endl;
  std::cout << "[main1]\n";
 
  std::cout << "[main2]\n";
  B =  mat_indexing(A, ri+1, ci);
  std::cout << "A(ri+1,ci) =" << std::endl;
  std::cout << B << std::endl << std::endl;
  B =  mat_indexing(A, Eigen::ArrayXi::LinSpaced(13,0,12).unaryExpr([](int x){return x%4;}), Eigen::ArrayXi::LinSpaced(4,0,3));
  std::cout << "A(ArrayXi::LinSpaced(13,0,12).unaryExpr([](int x){return x%4;}), ArrayXi::LinSpaced(4,0,3)) =" << std::endl;
  std::cout << B << std::endl << std::endl;
  std::cout << "[main2]\n";
}

mat_indexing()

template<class ArgType , class RowIndexType , class ColIndexType >

Eigen::CwiseNullaryOp<indexing_functor<ArgType,RowIndexType,ColIndexType>, typename indexing_functor<ArgType,RowIndexType,ColIndexType>::MatrixType> mat_indexing	(	const Eigen::MatrixBase< ArgType > &	arg,
		const RowIndexType &	row_indices,
		const ColIndexType &	col_indices
	)

Definition at line 31 of file nullary_indexing.cpp.

{
  typedef indexing_functor<ArgType,RowIndexType,ColIndexType> Func;
  typedef typename Func::MatrixType MatrixType;
  return MatrixType::NullaryExpr(row_indices.size(), col_indices.size(), Func(arg.derived(), row_indices, col_indices));
}