DLAR2V (3lapack)

applie a vector of real plane rotations from both sides to a sequence of 2-by-2 real symmetric matrices, defined by the elements of the vectors x, y and z

SYNOPSIS

  SUBROUTINE DLAR2V( N, X, Y, Z, INCX, C, S, INCC )

      INTEGER        INCC, INCX, N

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

PURPOSE

  DLAR2V applies a vector of real plane rotations from both sides to a
  sequence of 2-by-2 real symmetric matrices, defined by the elements of the
  vectors x, y and z. For i = 1,2,...,n

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

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

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

  INCX    (input) INTEGER
          The increment between elements of X, Y and Z. INCX > 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.