LAPACKE_dsbev_2stage()

lapack_int LAPACKE_dsbev_2stage	(	int	matrix_layout,
		char	jobz,
		char	uplo,
		lapack_int	n,
		lapack_int	kd,
		double *	ab,
		lapack_int	ldab,
		double *	w,
		double *	z,
		lapack_int	ldz
	)

Definition at line 35 of file lapacke_dsbev_2stage.c.

{
    lapack_int info = 0;
    lapack_int lwork = -1;
    double* work = NULL;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dsbev_2stage", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dsb_nancheck( matrix_layout, uplo, n, kd, ab, ldab ) ) {
            return -6;
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dsbev_2stage_work( matrix_layout, jobz, uplo, n, kd, ab, ldab, w, z,
                               ldz, &work_query, lwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for working array(s) */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dsbev_2stage_work( matrix_layout, jobz, uplo, n, kd, ab, ldab, w, z,
                               ldz, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dsbev_2stage", info );
    }
    return info;

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