LAPACKE_dpteqr()

lapack_int LAPACKE_dpteqr	(	int	matrix_layout,
		char	compz,
		lapack_int	n,
		double *	d,
		double *	e,
		double *	z,
		lapack_int	ldz
	)

Definition at line 35 of file lapacke_dpteqr.c.

{
    lapack_int info = 0;
    /* Additional scalars declarations for work arrays */
    lapack_int lwork;
    double* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dpteqr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -4;
        }
        if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
            return -5;
        }
        if( LAPACKE_lsame( compz, 'v' ) ) {
            if( LAPACKE_dge_nancheck( matrix_layout, n, n, z, ldz ) ) {
                return -6;
            }
        }
    }
#endif
    /* Additional scalars initializations for work arrays */
    if( LAPACKE_lsame( compz, 'n' ) ) {
        lwork = 1;
    } else {
        lwork = MAX(1,4*n-4);
    }
    /* 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_dpteqr_work( matrix_layout, compz, n, d, e, z, ldz, work );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dpteqr", info );
    }
    return info;

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