redhat man page for clanhe

CLANHE(l)								 )								 CLANHE(l)

NAME
       CLANHE  - return the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a com-
       plex hermitian matrix A

SYNOPSIS
       REAL FUNCTION CLANHE( NORM, UPLO, N, A, LDA, WORK )

	   CHARACTER NORM, UPLO

	   INTEGER   LDA, N

	   REAL      WORK( * )

	   COMPLEX   A( LDA, * )

PURPOSE
       CLANHE returns the value of the one norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of  a  com-
       plex hermitian matrix A.

DESCRIPTION
       CLANHE returns the value

	  CLANHE = ( 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 CLANHE as described above.

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

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

       A       (input) COMPLEX array, dimension (LDA,N)
	       The  hermitian  matrix  A.   If UPLO = 'U', the leading n by n upper triangular part of A contains the upper triangular part of the
	       matrix A, and the strictly lower triangular part of A is not referenced.  If UPLO = 'L', the leading n by n lower  triangular  part
	       of  A  contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. Note that
	       the imaginary parts of the diagonal elements need not be set and are assumed to be zero.

       LDA     (input) INTEGER
	       The leading dimension of the array A.  LDA >= max(N,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 							 CLANHE(l)