NAME

elpa_invert_triangular - Invert an upper triangular matrix

SYNOPSIS

FORTRAN INTERFACE

use elpa class(elpa_t), pointer :: elpa call elpa% invert_triangular (a, error) With the definitions of the input and output variables:

datatype :: a

The matrix a which should be inverted. The dimensions of matrix a must be set BEFORE with the methods elpa_set(3) and elpa_setup(3). The datatype of the matrix can be one of "real(kind=c_double)", "real(kind=c_float)", "complex(kind=c_double)", or "complex(kind=c_float)"

integer, optional :: error

The return error code of the function. Should be "ELPA_OK". The error code can be querried with the function elpa_strerr(3)

 

C INTERFACE

#include <elpa/elpa.h> elpa_t handle; void elpa_invert_triangular(elpa_t handle, datatype *a, int *error); With the definitions of the input and output variables:

elpa_t handle;

The handle to the ELPA object

datatype *a;

The matrix which should be inverted. The dimensions of the matrix must be set BEFORE with the methods elpa_set(3) and elpa_setup(3). The datatype can be one of "double", "float", "double complex", or "float complex". int * error; The error code of the function. Should be "ELPA_OK". The error codes can be querried with elpa_strerr(3)

DESCRIPTION

Inverts an upper triangular real or complex matrix. The functions elpa_init(3), elpa_allocate(3), elpa_set(3), and elpa_setup(3) must be called BEFORE elpa_eigenvalues can be called.

SEE ALSO

elpa2_print_kernels(1) elpa_init(3) elpa_allocate(3) elpa_set(3) elpa_setup(3) elpa_strerr(3) elpa_eigenvalues(3) elpa_eigenvectors(3) elpa_choleksy(3) elpa_solve_tridiagonal(3) elpa_hermitian_multiply(3) elpa_uninit(3) elpa_deallocate(3)