LAPACK
3.4.2
LAPACK: Linear Algebra PACKage

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Functions/Subroutines  
REAL function  clanht (NORM, N, D, E) 
CLANHT 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. 
REAL function clanht  (  character  NORM, 
integer  N,  
real, dimension( * )  D,  
complex, dimension( * )  E  
) 
CLANHT 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.
Download CLANHT + dependencies [TGZ] [ZIP] [TXT]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 complex Hermitian tridiagonal matrix A.
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 consistent matrix norm.
[in]  NORM  NORM is CHARACTER*1 Specifies the value to be returned in CLANHT as described above. 
[in]  N  N is INTEGER The order of the matrix A. N >= 0. When N = 0, CLANHT is set to zero. 
[in]  D  D is REAL array, dimension (N) The diagonal elements of A. 
[in]  E  E is COMPLEX array, dimension (N1) The (n1) subdiagonal or superdiagonal elements of A. 
Definition at line 102 of file clanht.f.