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## zlanht()

double precision function zlanht | ( | character | norm,
|  | integer | n,
|  | double precision, dimension( * ) | d,
|  | complex*16, dimension( * ) | e )

ZLANHT 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.

Download ZLANHT + dependencies [TGZ] [ZIP] [TXT]

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

  [in]

  NORM

      !>          NORM is CHARACTER*1
      !>          Specifies the value to be returned in ZLANHT as described
      !>          above.
      !>

  [in]

  N

      !>          N is INTEGER
      !>          The order of the matrix A.  N >= 0.  When N = 0, ZLANHT is
      !>          set to zero.
      !>

  [in]

  D

      !>          D is DOUBLE PRECISION array, dimension (N)
      !>          The diagonal elements of A.
      !>

  [in]

  E

      !>          E is COMPLEX*16 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.