TESTING/EIG/dlarfy.f(3)

NAME
TESTING/EIG/dlarfy.f

SYNOPSIS

  Functions/Subroutines
subroutine dlarfy (uplo, n, v, incv, tau, c, ldc, work)
DLARFY

Function/Subroutine Documentation

  subroutine dlarfy (character uplo, integer n, double precision, dimension( * ) v, integer incv, double precision tau, double precision, dimension( ldc, * ) c, integer ldc, double precision, dimension( * ) work)

DLARFY

Purpose:

    !>
    !> DLARFY applies an elementary reflector, or Householder matrix, H,
    !> to an n x n symmetric matrix C, from both the left and the right.
    !>
    !> H is represented in the form
    !>
    !>    H = I - tau * v * v'
    !>
    !> where  tau  is a scalar and  v  is a vector.
    !>
    !> If  tau  is  zero, then  H  is taken to be the unit matrix.
    !>

Parameters
    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the upper or lower triangular part of the
    !>          symmetric matrix C is stored.
    !>          = 'U':  Upper triangle
    !>          = 'L':  Lower triangle
    !>

    N

    !>          N is INTEGER
    !>          The number of rows and columns of the matrix C.  N >= 0.
    !>

    V

    !>          V is DOUBLE PRECISION array, dimension
    !>                  (1 + (N-1)*abs(INCV))
    !>          The vector v as described above.
    !>

    INCV

    !>          INCV is INTEGER
    !>          The increment between successive elements of v.  INCV must
    !>          not be zero.
    !>

    TAU

    !>          TAU is DOUBLE PRECISION
    !>          The value tau as described above.
    !>

    C

    !>          C is DOUBLE PRECISION array, dimension (LDC, N)
    !>          On entry, the matrix C.
    !>          On exit, C is overwritten by H * C * H'.
    !>

    LDC

    !>          LDC is INTEGER
    !>          The leading dimension of the array C.  LDC >= max( 1, N ).
    !>

    WORK

    !>          WORK is DOUBLE PRECISION array, dimension (N)
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 107 of file dlarfy.f.

Author

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