VMS Help FORTRAN, Intrinsic Procedures, xROT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SROT  (n, x, incx, y, incy, c, s)
  DROT  (n, x, incx, y, incy, c, s)
  CSROT (n, x, incx, y, incy, c, s)
  ZDROT (n, x, incx, y, incy, c, s)

  Subroutines that apply a Givens plane rotation to a pair of arrays.
  CSROT and ZDROT apply a real rotation to a pair of complex arrays.

  These routines are part of the BLAS1 Basic Set, and are only
  available on VAX processors.

  Arguments

    n

    Integer number of elements in arrays "x" and "y" to be accessed.

    x

    Array containing the elements to be accessed or array reference
    to the first such element.  The data type is REAL*4 for SROT,
    REAL*8 for DROT, COMPLEX*8 for CSROT, COMPLEX*16 for ZDROT.

    incx

    Integer index increment used in selecting which elements of array
    "x" are accessed.

    y

    Array containing the elements to be accessed or array reference
    to the first such element.  The data type is REAL*4 for SROT,
    REAL*8 for DROT, COMPLEX*8 for CSROT, COMPLEX*16 for ZDROT.

    incy

    Integer index increment used in selecting which elements of array
    "y" are accessed.

    c

    First rotation element, which can be interpreted as the cosine of
    the angle of rotation.  This argument can be generated by the
    xROTG routines.  The data type is REAL*4 for SROT and CSROT,
    REAL*8 for DROT and ZDROT.

    s

    Second rotation element, which can be interpreted as the sine of
    the angle of rotation.  This argument can be generated by the
    xROTG routines.  The data type is REAL*4 for SROT, REAL*8 for
    DROT, COMPLEX*8 for CSROT and COMPLEX*16 for ZDROT