dlangt man page on YellowDog

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DLANGT(l)			       )			     DLANGT(l)

NAME
       DLANGT  -  return  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	 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 version 3.0		 15 June 2000			     DLANGT(l)
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