DLARTV (3lapack)

applie a vector of real plane rotations to elements of the real vectors x and y

SYNOPSIS

  SUBROUTINE DLARTV( N, X, INCX, Y, INCY, C, S, INCC )

      INTEGER        INCC, INCX, INCY, N

      DOUBLE         PRECISION C( * ), S( * ), X( * ), Y( * )

PURPOSE

  DLARTV applies a vector of real plane rotations to elements of the real
  vectors x and y. For i = 1,2,...,n

     ( x(i) ) := (  c(i)  s(i) ) ( x(i) )
     ( y(i) )    ( -s(i)  c(i) ) ( y(i) )

ARGUMENTS

  N       (input) INTEGER
          The number of plane rotations to be applied.

  X       (input/output) DOUBLE PRECISION array,
          dimension (1+(N-1)*INCX) The vector x.

  INCX    (input) INTEGER
          The increment between elements of X. INCX > 0.

  Y       (input/output) DOUBLE PRECISION array,
          dimension (1+(N-1)*INCY) The vector y.

  INCY    (input) INTEGER
          The increment between elements of Y. INCY > 0.

  C       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
          The cosines of the plane rotations.

  S       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
          The sines of the plane rotations.

  INCC    (input) INTEGER
          The increment between elements of C and S. INCC > 0.