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DLANGT(1)	    LAPACK auxiliary routine (version 3.2)	     DLANGT(1)

NAME
       DLANGT  -  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
       tridiagonal matrix A

SYNOPSIS
       DOUBLE PRECISION FUNCTION DLANGT( NORM, N, DL, D, DU )

	   CHARACTER	NORM

	   INTEGER	N

	   DOUBLE	PRECISION D( * ), DL( * ), DU( * )

PURPOSE
       DLANGT	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 tridiagonal matrix A.

DESCRIPTION
       DLANGT returns the value
	  DLANGT = ( 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.

ARGUMENTS
       NORM    (input) CHARACTER*1
	       Specifies the value to  be  returned  in	 DLANGT	 as  described
	       above.

       N       (input) INTEGER
	       The  order of the matrix A.  N >= 0.  When N = 0, DLANGT is set
	       to zero.

       DL      (input) DOUBLE PRECISION array, dimension (N-1)
	       The (n-1) sub-diagonal elements of A.

       D       (input) DOUBLE PRECISION array, dimension (N)
	       The diagonal elements of A.

       DU      (input) DOUBLE PRECISION array, dimension (N-1)
	       The (n-1) super-diagonal elements of A.

 LAPACK auxiliary routine (versioNovember 2008			     DLANGT(1)
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