/sys$common/syshlp/helplib.hlb FORTRAN, Intrinsic Procedures, xNRM2  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  REAL*4 SNRM2  (n, x, incx)
  REAL*8 DNRM2  (n, x, incx)
  REAL*4 SCNRM2 (n, x, incx)
  REAL*8 DZNRM2 (n, x, incx)

  Functions that return the Euclidean norm of a array.  These
  functions cannot be inlined.

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

  Arguments

    n

    Integer number of elements in array "x" 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 SNRM2,
    REAL*8 for DNRM2, COMPLEX*8 for SCNRM2, COMPLEX*16 for DZNRM2.

    incx

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