NAME

       slarf.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slarf (SIDE, M, N, V, INCV, TAU, C, LDC, WORK)
           SLARF applies an elementary reflector to a general rectangular matrix.

Function/Subroutine Documentation

   subroutine slarf (character SIDE, integer M, integer N, real, dimension( * ) V, integer INCV,
       real TAU, real, dimension( ldc, * ) C, integer LDC, real, dimension( * ) WORK)
       SLARF applies an elementary reflector to a general rectangular matrix.

       Purpose:

            SLARF applies a real elementary reflector H to a real m by n matrix
            C, from either the left or the right. H is represented in the form

                  H = I - tau * v * v**T

            where tau is a real scalar and v is a real vector.

            If tau = 0, then H is taken to be the unit matrix.

       Parameters:
           SIDE

                     SIDE is CHARACTER*1
                     = 'L': form  H * C
                     = 'R': form  C * H

           M

                     M is INTEGER
                     The number of rows of the matrix C.

           N

                     N is INTEGER
                     The number of columns of the matrix C.

           V

                     V is REAL array, dimension
                                (1 + (M-1)*abs(INCV)) if SIDE = 'L'
                             or (1 + (N-1)*abs(INCV)) if SIDE = 'R'
                     The vector v in the representation of H. V is not used if
                     TAU = 0.

           INCV

                     INCV is INTEGER
                     The increment between elements of v. INCV <> 0.

           TAU

                     TAU is REAL
                     The value tau in the representation of H.

           C

                     C is REAL array, dimension (LDC,N)
                     On entry, the m by n matrix C.
                     On exit, C is overwritten by the matrix H * C if SIDE = 'L',
                     or C * H if SIDE = 'R'.

           LDC

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

           WORK

                     WORK is REAL array, dimension
                                    (N) if SIDE = 'L'
                                 or (M) if SIDE = 'R'

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           September 2012

Author

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