[ncl-talk] adjusting tension of a smooth overlaid on xyplot

[Sam McClatchie (NOAA Federal)]

Colleagues

I want to put a smooth line through a de-seasonalized time series that 
shows a trend and residual variability. I'm having trouble adjusting the 
tension of the smooth which I think needs to be less than one. I would 
like the overlaid smooth curve to be much more smooth than the data, but 
I'm basically getting a high order polynomial smooth at present.

Here is a snip of code:

(Note: the xyplot tsplots(2) was previously defined)

xi = (/spice_ts_ss&time/)
yi = monthly_anom(:,0,0)
xo = fspan(1985., 2015., 200)
ftsetp("sig",0.5)
yo = ftcurv(xi,yi,xo)

colors = (/"red","green","blue"/)
resplot at xyLineColor   = colors(0)
tsplots(3)  = gsn_csm_xy (wks,xo,yo,resplot)
overlay(tsplots(2), tsplots(3))

Changing the value of the sig parameter in ftsetp between 0.1 to 40 
seems to have no effect, which suggests that I am misusing something?

Thanks in advance,
Sam
-- 
email signature Sam McClatchie,
Supervisory oceanographer,
NOAA lead for the CalCOFI program
Southwest Fisheries Science Center, NOAA,
8901 La Jolla Shores Dr.
La Jolla, CA 92037-1509, U.S.A.
email <Sam.McClatchie at noaa.gov>
Office: 858 546 7083, Cellular:  858 752 8495
Research home page <www.fishocean.info>
CalCOFI 66 years
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