CXML
        	    
LAPACK version 3.0
dlantp(3)

PURPOSE
  DLANTP - return the value of the one norm, or the Frobenius norm, or the
  infinity norm, or the element of largest absolute value of a triangular
  matrix A, supplied in packed form

SYNTAX
  DOUBLE PRECISION FUNCTION DLANTP( NORM, UPLO, DIAG, N, AP, WORK )

      CHARACTER	   DIAG, NORM, UPLO

      INTEGER	   N

      DOUBLE	   PRECISION AP( * ), WORK( * )

DESCRIPTION
  DLANTP returns the value of the one norm, or the Frobenius norm, or the
  infinity norm, or the element of largest absolute value of a triangular
  matrix A, supplied in packed form.

DESCRIPTION
  DLANTP returns the value

     DLANTP = ( 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 DLANTP as described above.

  UPLO	  (input) CHARACTER*1
	  Specifies whether the matrix A is upper or lower triangular.	=
	  'U':	Upper triangular
	  = 'L':  Lower triangular

  DIAG	  (input) CHARACTER*1
	  Specifies whether or not the matrix A is unit triangular.  = 'N':
	  Non-unit triangular
	  = 'U':  Unit triangular

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

  AP	  (input) DOUBLE PRECISION array, dimension (N*(N+1)/2)
	  The upper or lower triangular matrix A, packed columnwise in a
	  linear array.	 The j-th column of A is stored in the array AP as
	  follows: if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; if
	  UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.  Note that
	  when DIAG = 'U', the elements of the array AP corresponding to the
	  diagonal elements of the matrix A are not referenced, but are
	  assumed to be one.

  WORK	  (workspace) DOUBLE PRECISION array, dimension (LWORK),
	  where LWORK >= N when NORM = 'I'; otherwise, WORK is not
	  referenced.