listwise_deletion.hpp

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#ifndef MLPACK_CORE_DATA_IMPUTE_STRATEGIES_LISTWISE_DELETION_HPP
#define MLPACK_CORE_DATA_IMPUTE_STRATEGIES_LISTWISE_DELETION_HPP
 
#include <mlpack/prereqs.hpp>
 
namespace mlpack {
namespace data {
template <typename T>
class ListwiseDeletion
{
 public:
  void Impute(arma::Mat<T>& input,
              const T& mappedValue,
              const size_t dimension,
              const bool columnMajor = true)
  {
    std::vector<arma::uword> colsToKeep;
 
    if (columnMajor)
    {
      for (size_t i = 0; i < input.n_cols; ++i)
      {
         if (!(input(dimension, i) == mappedValue ||
             std::isnan(input(dimension, i))))
         {
           colsToKeep.push_back(i);
         }
      }
      input = input.cols(arma::uvec(colsToKeep));
    }
    else
    {
      for (size_t i = 0; i < input.n_rows; ++i)
      {
        if (!(input(i, dimension) == mappedValue ||
             std::isnan(input(i, dimension))))
        {
           colsToKeep.push_back(i);
        }
      }
      input = input.rows(arma::uvec(colsToKeep));
    }
  }
}; // class ListwiseDeletion
 
} // namespace data
} // namespace mlpack
 
#endif