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CLANHB(3F)							    CLANHB(3F)

NAME
     CLANHB - return the value of the one norm, or the Frobenius norm, or the
     infinity norm, or the element of largest absolute value of an n by n
     hermitian band matrix A, with k super-diagonals

SYNOPSIS
     REAL FUNCTION CLANHB( NORM, UPLO, N, K, AB, LDAB, WORK )

	 CHARACTER NORM, UPLO

	 INTEGER   K, LDAB, N

	 REAL	   WORK( * )

	 COMPLEX   AB( LDAB, * )

PURPOSE
     CLANHB  returns the value of the one norm,	 or the Frobenius norm, or the
     infinity norm,  or the element of	largest absolute value	of an n by n
     hermitian band matrix A,  with k super-diagonals.

DESCRIPTION
     CLANHB returns the value

	CLANHB = ( 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 CLANHB as described above.

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

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

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CLANHB(3F)							    CLANHB(3F)

     K	     (input) INTEGER
	     The number of super-diagonals or sub-diagonals of the band matrix
	     A.	 K >= 0.

     AB	     (input) COMPLEX array, dimension (LDAB,N)
	     The upper or lower triangle of the hermitian band matrix A,
	     stored in the first K+1 rows of AB.  The j-th column of A is
	     stored in the j-th column of the array AB as follows:  if UPLO =
	     'U', AB(k+1+i-j,j) = A(i,j) for max(1,j-k)<=i<=j; if UPLO = 'L',
	     AB(1+i-j,j)   = A(i,j) for j<=i<=min(n,j+k).  Note that the
	     imaginary parts of the diagonal elements need not be set and are
	     assumed to be zero.

     LDAB    (input) INTEGER
	     The leading dimension of the array AB.  LDAB >= K+1.

     WORK    (workspace) REAL array, dimension (LWORK),
	     where LWORK >= N when NORM = 'I' or '1' or 'O'; otherwise, WORK
	     is not referenced.

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