taper_n problem

NCL users,

I am trying to use NCL v6.1.2's "taper_n" function, with no success. Below is the boiled-down version of my program:

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"

begin

 x = new(100,"float",-999)
 x = 1.
 xTaper = taper_n(x, 0.2, 0, 0)
 print(x + " " + xTaper)

end

I expected the printout to show xTaper smoothly reduced (to 0?) at the ends, but apparently no tapering was done! (xTaper = x = 1 for all points):
(0) 1 1
(1) 1 1
(2) 1 1
...
(48) 1 1
(49) 1 1
(50) 1 1
...
(97) 1 1
(98) 1 1
(99) 1 1

I've also tried this unsuccessfully with "xTaper = taper(x,0.2,0)". Any help would be appreciated!
Thanks,
Jim Benedict

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Received on Wed Apr 16 15:07:46 2014