# RedHat 9 (Linux i386) - man page for clanht (redhat section l)

```CLANHT(l)								 )								 CLANHT(l)

NAME
CLANHT  - 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 tridiagonal matrix A

SYNOPSIS
REAL FUNCTION CLANHT( NORM, N, D, E )

CHARACTER NORM

INTEGER   N

REAL      D( * )

COMPLEX   E( * )

PURPOSE
CLANHT 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 tridiagonal matrix A.

DESCRIPTION
CLANHT returns the value

CLANHT = ( 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 CLANHT as described above.

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

D       (input) REAL array, dimension (N)
The diagonal elements of A.

E       (input) COMPLEX array, dimension (N-1)
The (n-1) sub-diagonal or super-diagonal elements of A.

LAPACK version 3.0						   15 June 2000 							 CLANHT(l)```