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## dlar2v()

subroutine dlar2v | ( | integer | n,
|  | double precision, dimension( * ) | x,
|  | double precision, dimension( * ) | y,
|  | double precision, dimension( * ) | z,
|  | integer | incx,
|  | double precision, dimension( * ) | c,
|  | double precision, dimension( * ) | s,
|  | integer | incc )

DLAR2V applies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.

Download DLAR2V + dependencies [TGZ] [ZIP] [TXT]

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) )
      !>

Parameters

  [in]

  N

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

  [in,out]

  X

      !>          X is DOUBLE PRECISION array,
      !>                         dimension (1+(N-1)*INCX)
      !>          The vector x.
      !>

  [in,out]

  Y

      !>          Y is DOUBLE PRECISION array,
      !>                         dimension (1+(N-1)*INCX)
      !>          The vector y.
      !>

  [in,out]

  Z

      !>          Z is DOUBLE PRECISION array,
      !>                         dimension (1+(N-1)*INCX)
      !>          The vector z.
      !>

  [in]

  INCX

      !>          INCX is INTEGER
      !>          The increment between elements of X, Y and Z. INCX > 0.
      !>

  [in]

  C

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

  [in]

  S

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

  [in]

  INCC

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

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