SRC/clanht.f(3) | Library Functions Manual | SRC/clanht.f(3) |
NAME
SRC/clanht.f
SYNOPSIS
Functions/Subroutines
real function clanht (norm, n, d, e)
CLANHT returns the value of the 1-norm, or the Frobenius norm, or the
infinity norm, or the element of largest absolute value of a complex
Hermitian tridiagonal matrix.
Function/Subroutine Documentation
real function clanht (character norm, integer n, real, dimension( * ) d, complex, dimension( * ) e)
CLANHT returns the value of the 1-norm, or the Frobenius norm, or the infinity norm, or the element of largest absolute value of a complex Hermitian tridiagonal matrix.
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 complex Hermitian tridiagonal matrix A.
Returns
CLANHT
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.
Parameters
NORM
NORM is CHARACTER*1 Specifies the value to be returned in CLANHT as described above.
N
N is INTEGER The order of the matrix A. N >= 0. When N = 0, CLANHT is set to zero.
D
D is REAL array, dimension (N) The diagonal elements of A.
E
E is COMPLEX array, dimension (N-1) The (n-1) sub-diagonal or super-diagonal elements of A.
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 100 of file clanht.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.12.0 | LAPACK |