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DLANGE(l)			       )			     DLANGE(l)

NAME
       DLANGE  -  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
       matrix A

SYNOPSIS
       DOUBLE PRECISION FUNCTION DLANGE( NORM, M, N, A, LDA, WORK )

	   CHARACTER	NORM

	   INTEGER	LDA, M, N

	   DOUBLE	PRECISION A( LDA, * ), WORK( * )

PURPOSE
       DLANGE 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
       matrix A.

DESCRIPTION
       DLANGE returns the value

	  DLANGE = ( 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	 DLANGE	 as  described
	       above.

       M       (input) INTEGER
	       The  number  of	rows  of  the  matrix A.  M >= 0.  When M = 0,
	       DLANGE is set to zero.

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

       A       (input) DOUBLE PRECISION array, dimension (LDA,N)
	       The m by n matrix A.

       LDA     (input) INTEGER
	       The leading dimension of the array A.  LDA >= max(M,1).

       WORK    (workspace) DOUBLE PRECISION array, dimension (LWORK),
	       where LWORK >= M when NORM = 'I'; otherwise, WORK is not refer‐
	       enced.

LAPACK version 3.0		 15 June 2000			     DLANGE(l)
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