zlanht.f (3)  Linux Manuals
NAME
zlanht.f 
SYNOPSIS
Functions/Subroutines
DOUBLE PRECISION function zlanht (NORM, N, D, E)
ZLANHT returns the value of the 1norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a complex Hermitian tridiagonal matrix.
Function/Subroutine Documentation
DOUBLE PRECISION function zlanht (characterNORM, integerN, double precision, dimension( * )D, complex*16, dimension( * )E)
ZLANHT returns the value of the 1norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a complex Hermitian tridiagonal matrix.
Purpose:

ZLANHT 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 tridiagonal matrix A.
Returns:

ZLANHT
ZLANHT = ( 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 consistent matrix norm.
Parameters:

NORM
NORM is CHARACTER*1 Specifies the value to be returned in ZLANHT as described above.
NN is INTEGER The order of the matrix A. N >= 0. When N = 0, ZLANHT is set to zero.
DD is DOUBLE PRECISION array, dimension (N) The diagonal elements of A.
EE is COMPLEX*16 array, dimension (N1) The (n1) subdiagonal or superdiagonal elements of A.
Author:

Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
 September 2012
Definition at line 102 of file zlanht.f.
Author
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