SYNOPSIS

ZDROT(

SUBROUTINE        N,
                  CX,
                  INCX,
                  CY,
                  INCY,
                  C,
                  S
                  )
    INTEGER       INCX,
                  INCY,
                  N
    DOUBLE        PRECISION
                  C,
                  S
    COMPLEX*16    CX(
                  *
                  ),
                  CY(
                  *
                  )
    INTEGER       I,
                  IX,
                  IY
    COMPLEX*16    CTEMP
    IF(           N.LE.0
                  )
                  RETURN
    IF(           INCX.EQ.1
                  .AND.
                  INCY.EQ.1
                  )
                  GO
                  TO
                  20
    IX            =
                  1
    IY            =
                  1
    IF(           INCX.LT.0
                  )
                  IX
                  =
                  (
                  -N+1
                  )*INCX
                  +
                  1
    IF(           INCY.LT.0
                  )
                  IY
                  =
                  (
                  -N+1
                  )*INCY
                  +
                  1
    DO            10
                  I
                  =
                  1,
                  N
    CTEMP         =
                  C*CX(
                  IX
                  )
                  +
                  S*CY(
                  IY
                  )
    CY(           IY
                  )
                  =
                  C*CY(
                  IY
                  )
                  -
                  S*CX(
                  IX
                  )
    CX(           IX
                  )
                  =
                  CTEMP
    IX            =
                  IX
                  +
                  INCX
    IY            =
                  IY
                  +
                  INCY
    10            CONTINUE
    RETURN
    20            CONTINUE
    DO            30
                  I
                  =
                  1,
                  N
    CTEMP         =
                  C*CX(
                  I
                  )
                  +
                  S*CY(
                  I
                  )
    CY(           I
                  )
                  =
                  C*CY(
                  I
                  )
                  -
                  S*CX(
                  I
                  )
    CX(           I
                  )
                  =
                  CTEMP
    30            CONTINUE
    RETURN
    END

PURPOSE