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LAPACK version 3.0
dlange(3)

PURPOSE
  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

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

      CHARACTER	   NORM

      INTEGER	   LDA, M, N

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

DESCRIPTION
  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
	  referenced.