math/is__lower__triangular_8hpp_source.html

#ifndef STAN_MATH_PRIM_ERR_IS_LOWER_TRIANGULAR_HPP

#define STAN_MATH_PRIM_ERR_IS_LOWER_TRIANGULAR_HPP


#include <stan/math/prim/fun/Eigen.hpp>

#include <stan/math/prim/err/is_not_nan.hpp>

#include <stan/math/prim/meta.hpp>


namespace stan {

namespace math {


template <typename EigMat, require_eigen_matrix_dynamic_t<EigMat>* = nullptr>

inline bool is_lower_triangular(const EigMat& y) {

  return y.unaryExpr([](auto&& x) { return is_not_nan(x) ? x : 1.0; })

      .transpose()

      .isUpperTriangular();

}


}  // namespace math

}  // namespace stan

#endif

Eigen.hpp

stan::math::transpose
auto transpose(Arg &&a)
Transposes a kernel generator expression.
Definition transpose.hpp:139

is_not_nan.hpp

stan::math::is_lower_triangular
bool is_lower_triangular(const EigMat &y)
Return true is matrix is lower triangular.
Definition is_lower_triangular.hpp:21

stan::math::is_not_nan
bool is_not_nan(const T_y &y)
Return true if y is not NaN.
Definition is_not_nan.hpp:23

stan
The lgamma implementation in stan-math is based on either the reentrant safe lgamma_r implementation ...
Definition unit_vector_constrain.hpp:15

meta.hpp