LAPACKE_sstegr()

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

Definition at line 35 of file lapacke_sstegr.c.

{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    float* work = NULL;
    lapack_int iwork_query;
    float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_sstegr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_s_nancheck( 1, &abstol, 1 ) ) {
            return -11;
        }
        if( LAPACKE_s_nancheck( n, d, 1 ) ) {
            return -5;
        }
        if( LAPACKE_s_nancheck( n-1, e, 1 ) ) {
            return -6;
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_s_nancheck( 1, &vl, 1 ) ) {
                return -7;
            }
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_s_nancheck( 1, &vu, 1 ) ) {
                return -8;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_sstegr_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 = (lapack_int)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 = (float*)LAPACKE_malloc( sizeof(float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_sstegr_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_sstegr", info );
    }
    return info;

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