stochastic_column_free.hpp

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#ifndef STAN_MATH_PRIM_FUN_STOCHASTIC_COLUMN_FREE_HPP
#define STAN_MATH_PRIM_FUN_STOCHASTIC_COLUMN_FREE_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/simplex_free.hpp>
 
namespace stan {
namespace math {
 
template <typename Mat, require_eigen_matrix_dynamic_t<Mat>* = nullptr,
          require_not_st_var<Mat>* = nullptr>
inline plain_type_t<Mat> stochastic_column_free(const Mat& y) {
  auto&& y_ref = to_ref(y);
  const Eigen::Index M = y_ref.cols();
  plain_type_t<Mat> ret(y_ref.rows() - 1, M);
  for (Eigen::Index i = 0; i < M; ++i) {
    ret.col(i) = simplex_free(y_ref.col(i));
  }
  return ret;
}
 
template <typename T, require_std_vector_t<T>* = nullptr>
inline auto stochastic_column_free(const T& y) {
  return apply_vector_unary<T>::apply(
      y, [](auto&& v) { return stochastic_column_free(v); });
}
 
}  // namespace math
}  // namespace stan
 
#endif