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-*> \brief \b DLANST returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a real symmetric tridiagonal matrix.
-*
-*  =========== DOCUMENTATION ===========
-*
-* Online html documentation available at 
-*            http://www.netlib.org/lapack/explore-html/ 
-*
-*> \htmlonly
-*> Download DLANST + dependencies 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlanst.f"> 
-*> [TGZ]</a> 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlanst.f"> 
-*> [ZIP]</a> 
-*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlanst.f"> 
-*> [TXT]</a>
-*> \endhtmlonly 
-*
-*  Definition:
-*  ===========
-*
-*       DOUBLE PRECISION FUNCTION DLANST( NORM, N, D, E )
-* 
-*       .. Scalar Arguments ..
-*       CHARACTER          NORM
-*       INTEGER            N
-*       ..
-*       .. Array Arguments ..
-*       DOUBLE PRECISION   D( * ), E( * )
-*       ..
-*  
-*
-*> \par Purpose:
-*  =============
-*>
-*> \verbatim
-*>
-*> DLANST  returns the value of the one norm,  or the Frobenius norm, or
-*> the  infinity norm,  or the  element of  largest absolute value  of a
-*> real symmetric tridiagonal matrix A.
-*> \endverbatim
-*>
-*> \return DLANST
-*> \verbatim
-*>
-*>    DLANST = ( max(abs(A(i,j))), NORM = 'M' or 'm'
-*>             (
-*>             ( norm1(A),         NORM = '1', 'O' or 'o'
-*>             (
-*>             ( normI(A),         NORM = 'I' or 'i'
-*>             (
-*>             ( normF(A),         NORM = 'F', 'f', 'E' or 'e'
-*>
-*> where  norm1  denotes the  one norm of a matrix (maximum column sum),
-*> normI  denotes the  infinity norm  of a matrix  (maximum row sum) and
-*> normF  denotes the  Frobenius norm of a matrix (square root of sum of
-*> squares).  Note that  max(abs(A(i,j)))  is not a consistent matrix norm.
-*> \endverbatim
-*
-*  Arguments:
-*  ==========
-*
-*> \param[in] NORM
-*> \verbatim
-*>          NORM is CHARACTER*1
-*>          Specifies the value to be returned in DLANST as described
-*>          above.
-*> \endverbatim
-*>
-*> \param[in] N
-*> \verbatim
-*>          N is INTEGER
-*>          The order of the matrix A.  N >= 0.  When N = 0, DLANST is
-*>          set to zero.
-*> \endverbatim
-*>
-*> \param[in] D
-*> \verbatim
-*>          D is DOUBLE PRECISION array, dimension (N)
-*>          The diagonal elements of A.
-*> \endverbatim
-*>
-*> \param[in] E
-*> \verbatim
-*>          E is DOUBLE PRECISION array, dimension (N-1)
-*>          The (n-1) sub-diagonal or super-diagonal elements of A.
-*> \endverbatim
-*
-*  Authors:
-*  ========
-*
-*> \author Univ. of Tennessee 
-*> \author Univ. of California Berkeley 
-*> \author Univ. of Colorado Denver 
-*> \author NAG Ltd. 
-*
-*> \date September 2012
-*
-*> \ingroup auxOTHERauxiliary
-*
-*  =====================================================================
-      DOUBLE PRECISION FUNCTION DLANST( NORM, N, D, E )
-*
-*  -- LAPACK auxiliary routine (version 3.4.2) --
-*  -- LAPACK is a software package provided by Univ. of Tennessee,    --
-*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-*     September 2012
-*
-*     .. Scalar Arguments ..
-      CHARACTER          NORM
-      INTEGER            N
-*     ..
-*     .. Array Arguments ..
-      DOUBLE PRECISION   D( * ), E( * )
-*     ..
-*
-*  =====================================================================
-*
-*     .. Parameters ..
-      DOUBLE PRECISION   ONE, ZERO
-      PARAMETER          ( ONE = 1.0D+0, ZERO = 0.0D+0 )
-*     ..
-*     .. Local Scalars ..
-      INTEGER            I
-      DOUBLE PRECISION   ANORM, SCALE, SUM
-*     ..
-*     .. External Functions ..
-      LOGICAL            LSAME, DISNAN
-      EXTERNAL           LSAME, DISNAN
-*     ..
-*     .. External Subroutines ..
-      EXTERNAL           DLASSQ
-*     ..
-*     .. Intrinsic Functions ..
-      INTRINSIC          ABS, SQRT
-*     ..
-*     .. Executable Statements ..
-*
-      IF( N.LE.0 ) THEN
-         ANORM = ZERO
-      ELSE IF( LSAME( NORM, 'M' ) ) THEN
-*
-*        Find max(abs(A(i,j))).
-*
-         ANORM = ABS( D( N ) )
-         DO 10 I = 1, N - 1
-            SUM = ABS( D( I ) )
-            IF( ANORM .LT. SUM .OR. DISNAN( SUM ) ) ANORM = SUM
-            SUM = ABS( E( I ) )
-            IF( ANORM .LT. SUM .OR. DISNAN( SUM ) ) ANORM = SUM
-   10    CONTINUE
-      ELSE IF( LSAME( NORM, 'O' ) .OR. NORM.EQ.'1' .OR.
-     $         LSAME( NORM, 'I' ) ) THEN
-*
-*        Find norm1(A).
-*
-         IF( N.EQ.1 ) THEN
-            ANORM = ABS( D( 1 ) )
-         ELSE
-            ANORM = ABS( D( 1 ) )+ABS( E( 1 ) )
-            SUM = ABS( E( N-1 ) )+ABS( D( N ) )
-            IF( ANORM .LT. SUM .OR. DISNAN( SUM ) ) ANORM = SUM
-            DO 20 I = 2, N - 1
-               SUM = ABS( D( I ) )+ABS( E( I ) )+ABS( E( I-1 ) )
-               IF( ANORM .LT. SUM .OR. DISNAN( SUM ) ) ANORM = SUM
-   20       CONTINUE
-         END IF
-      ELSE IF( ( LSAME( NORM, 'F' ) ) .OR. ( LSAME( NORM, 'E' ) ) ) THEN
-*
-*        Find normF(A).
-*
-         SCALE = ZERO
-         SUM = ONE
-         IF( N.GT.1 ) THEN
-            CALL DLASSQ( N-1, E, 1, SCALE, SUM )
-            SUM = 2*SUM
-         END IF
-         CALL DLASSQ( N, D, 1, SCALE, SUM )
-         ANORM = SCALE*SQRT( SUM )
-      END IF
-*
-      DLANST = ANORM
-      RETURN
-*
-*     End of DLANST
-*
-      END