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CLANSB(l)			       )			     CLANSB(l)

NAME
       CLANSB  -  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 symmetric band matrix A, with k super-diagonals

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

	   CHARACTER NORM, UPLO

	   INTEGER   K, LDAB, N

	   REAL	     WORK( * )

	   COMPLEX   AB( LDAB, * )

PURPOSE
       CLANSB 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
       symmetric band matrix A, with k super-diagonals.

DESCRIPTION
       CLANSB returns the value

	  CLANSB = ( 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	 CLANSB	 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  part  is
	       supplied
	       = 'L':  Lower triangular part is supplied

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

       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 symmetric 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).

       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.

LAPACK version 3.0		 15 June 2000			     CLANSB(l)
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