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CLANTP(l)					)					CLANTP(l)

NAME
       CLANTP - 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

SYNOPSIS
       REAL FUNCTION CLANTP( NORM, UPLO, DIAG, N, AP, WORK )

	   CHARACTER DIAG, NORM, UPLO

	   INTEGER   N

	   REAL      WORK( * )

	   COMPLEX   AP( * )

PURPOSE
       CLANTP 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
       CLANTP returns the value

	  CLANTP = ( 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 CLANTP as described above.

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

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

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

       AP      (input) COMPLEX 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 correspond-
	       ing to the diagonal elements of the matrix A are not referenced, but  are  assumed
	       to be one.

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

LAPACK version 3.0			   15 June 2000 				CLANTP(l)
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