CLANGB man page on IRIX

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CLANGB(3F)							    CLANGB(3F)

NAME
     CLANGB - 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 band
     matrix A, with kl sub-diagonals and ku super-diagonals

SYNOPSIS
     REAL FUNCTION CLANGB( NORM, N, KL, KU, AB, LDAB, WORK )

	 CHARACTER NORM

	 INTEGER   KL, KU, LDAB, N

	 REAL	   WORK( * )

	 COMPLEX   AB( LDAB, * )

PURPOSE
     CLANGB  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
     band matrix  A,  with kl sub-diagonals and ku super-diagonals.

DESCRIPTION
     CLANGB returns the value

	CLANGB = ( 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 CLANGB as described above.

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

     KL	     (input) INTEGER
	     The number of sub-diagonals of the matrix A.  KL >= 0.

									Page 1

CLANGB(3F)							    CLANGB(3F)

     KU	     (input) INTEGER
	     The number of super-diagonals of the matrix A.  KU >= 0.

     AB	     (input) COMPLEX array, dimension (LDAB,N)
	     The band matrix A, stored in rows 1 to KL+KU+1.  The j-th column
	     of A is stored in the j-th column of the array AB as follows:
	     AB(ku+1+i-j,j) = A(i,j) for max(1,j-ku)<=i<=min(n,j+kl).

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

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

									Page 2

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