Where is dim_sum_n()?

Howdy,

I'm trying to run the first example code segment from

<http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_sum_n.shtml>

My NCL script is as follows (using 5.1.0):

; Include files
 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

begin
  q = random_uniform(-20,100,(/3,5,10/))
  qav = dim_sum_n(q,2) ;==> qav(3,5)
end

But when I run it, I get a message saying that dim_sum_n is undefined.
However, if I replace dim_sum_n(q,2) with dim_sum(q), it works. I've
tried loading up the contributed.ncl, but this doesn't help. I don't
see anything in the documentation for dim_sum_n that specifies a module
to load. Am I being an idiot, or did dim_sum_n() somehow get left out?

Thanks,

Don

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