container::kernels::lapack_heevx< T, Device > Struct Template Reference

#include <lapack.h>

Collaboration diagram for container::kernels::lapack_heevx< T, Device >:

Public Types
using	Real = typename GetTypeReal< T >::type

Public Member Functions
void	operator() (const int dim, const int lda, const T *Mat, const int neig, Real *eigen_val, T *eigen_vec)
	Computes selected eigenvalues and, optionally, eigenvectors of a complex Hermitian matrix.

Member Typedef Documentation

Real

template<typename T , typename Device >

using container::kernels::lapack_heevx< T, Device >::Real = typename GetTypeReal<T>::type

Member Function Documentation

operator()()

template<typename T , typename Device >

void container::kernels::lapack_heevx< T, Device >::operator()	(	const int	dim,
		const int	lda,
		const T *	Mat,
		const int	neig,
		Real *	eigen_val,
		T *	eigen_vec
	)

Computes selected eigenvalues and, optionally, eigenvectors of a complex Hermitian matrix.

This function solves the problem A*x = lambda*x, where A is a Hermitian matrix. It computes a subset of eigenvalues and, optionally, the corresponding eigenvectors.

Parameters

	dim	The order of the matrix A. dim >= 0.
	lda	The leading dimension of the array Mat. lda >= max(1, dim).
[in]	Mat	On entry, the Hermitian matrix A. On exit, A is kept. Only used to provide values of matrix.
	neig	The number of eigenvalues to be found. 0 <= neig <= dim.
	eigen_val	On normal exit, the first neig elements contain the selected eigenvalues in ascending order.
	eigen_vec	If eigen_vec is not nullptr, then on exit it contains the orthonormal eigenvectors of the matrix A. The eigenvectors are stored in the columns of eigen_vec, in the same order as the eigenvalues.

Note

See LAPACK ZHEEVX or CHEEVX documentation for more details. This routine allocates auxiliary memory inside to prevent input matrix from being destroyed.

---

The documentation for this struct was generated from the following file:

• /home/runner/work/abacus-develop/abacus-develop/source/source_base/module_container/ATen/kernels/lapack.h