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## dlargv()

subroutine dlargv | ( | integer | n,
|  | double precision, dimension( * ) | x,
|  | integer | incx,
|  | double precision, dimension( * ) | y,
|  | integer | incy,
|  | double precision, dimension( * ) | c,
|  | integer | incc )

DLARGV generates a vector of plane rotations with real cosines and real sines.

Download DLARGV + dependencies [TGZ] [ZIP] [TXT]

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  )
      !>

Parameters

  [in]

  N

      !>          N is INTEGER
      !>          The number of plane rotations to be generated.
      !>

  [in,out]

  X

      !>          X is 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.
      !>

  [in]

  INCX

      !>          INCX is INTEGER
      !>          The increment between elements of X. INCX > 0.
      !>

  [in,out]

  Y

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

  [in]

  INCY

      !>          INCY is INTEGER
      !>          The increment between elements of Y. INCY > 0.
      !>

  [out]

  C

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

  [in]

  INCC

      !>          INCC is INTEGER
      !>          The increment between elements of C. INCC > 0.
      !>

Author
  Univ. of Tennessee
  Univ. of California Berkeley
  Univ. of Colorado Denver
  NAG Ltd.