DLARGV (3lapack)

generate a vector of real plane rotations, determined by elements of the real vectors x and y

SYNOPSIS

  SUBROUTINE DLARGV( N, X, INCX, Y, INCY, C, INCC )

      INTEGER        INCC, INCX, INCY, N

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

PURPOSE

  DLARGV generates a vector of real plane rotations, determined by elements
  of the real vectors x and y. For i = 1,2,...,n

     (  c(i)  s(i) ) ( x(i) ) = ( a(i) )
     ( -s(i)  c(i) ) ( y(i) ) = (   0  )

ARGUMENTS

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

  X       (input/output) DOUBLE PRECISION array,
          dimension (1+(N-1)*INCX) On entry, the vector x.  On exit, x(i) is
          overwritten by a(i), for i = 1,...,n.

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

  Y       (input/output) DOUBLE PRECISION array,
          dimension (1+(N-1)*INCY) On entry, the vector y.  On exit, the
          sines of the plane rotations.

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

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

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