lapacke_zstegr.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_zstegr (int matrix_layout, char jobz, char range, lapack_int n, double *d, double *e, double vl, double vu, lapack_int il, lapack_int iu, double abstol, lapack_int *m, double *w, lapack_complex_double *z, lapack_int ldz, lapack_int *isuppz)

Function Documentation

LAPACKE_zstegr()

lapack_int LAPACKE_zstegr	(	int	matrix_layout,
		char	jobz,
		char	range,
		lapack_int	n,
		double *	d,
		double *	e,
		double	vl,
		double	vu,
		lapack_int	il,
		lapack_int	iu,
		double	abstol,
		lapack_int *	m,
		double *	w,
		lapack_complex_double *	z,
		lapack_int	ldz,
		lapack_int *	isuppz )

Definition at line 35 of file lapacke_zstegr.c.

{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    double* work = NULL;
    lapack_int iwork_query;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zstegr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( 1, &abstol, 1 ) ) {
            return -11;
        }
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -5;
        }
        if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
            return -6;
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_d_nancheck( 1, &vl, 1 ) ) {
                return -7;
            }
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_d_nancheck( 1, &vu, 1 ) ) {
                return -8;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_zstegr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
                                iu, abstol, m, w, z, ldz, isuppz, &work_query,
                                lwork, &iwork_query, liwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    liwork = iwork_query;
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_zstegr_work( matrix_layout, jobz, range, n, d, e, vl, vu, il,
                                iu, abstol, m, w, z, ldz, isuppz, work, lwork,
                                iwork, liwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zstegr", info );
    }
    return info;
}