CLANHE man page on IRIX

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CLANHE(3F)							    CLANHE(3F)

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 complex
     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 complex
     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.

									Page 1

CLANHE(3F)							    CLANHE(3F)

     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.

									Page 2

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