TESTING/EIG/dlarfy.f(3)    Library Functions Manual    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
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/EIG/dlarfy.f(3)