binarize.hpp

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#ifndef MLPACK_CORE_DATA_BINARIZE_HPP
#define MLPACK_CORE_DATA_BINARIZE_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace data {

template<typename T>
void Binarize(const arma::Mat<T>& input,
              arma::Mat<T>& output,
              const double threshold)
{
  output.copy_size(input);

  const T *inPtr = input.memptr();
  T *outPtr = output.memptr();

  #pragma omp parallel for
  for (omp_size_t i = 0; i < (omp_size_t) input.n_elem; ++i)
    outPtr[i] = inPtr[i] > threshold;
}

template<typename T>
void Binarize(const arma::Mat<T>& input,
              arma::Mat<T>& output,
              const double threshold,
              const size_t dimension)
{
  output = input;

  #pragma omp parallel for
  for (omp_size_t i = 0; i < (omp_size_t) input.n_cols; ++i)
    output(dimension, i) = input(dimension, i) > threshold;
}

} // namespace data
} // namespace mlpack

#endif