nullary_indexing.cpp File Reference

#include <Eigen/Core>
#include <iostream>

Classes
class	indexing_functor< ArgType, RowIndexType, ColIndexType >

Functions
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)
int	main ()

Function Documentation

main()

int main

(

)

           {
  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";
}

References mat_indexing(), and plotDoE::x.

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
	)

                                                                                                                    {
  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));
}

Referenced by main().