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

[Mary Haley]

Hi Sam,

It appears you are using the parameter correctly.

Please try running the attached example, which shows a simple XY plot, and
different tension factors using the "sig" parameter with ftcurv.

If this doesn't shine a light on the problem at your end, then can you
provide us with a script and the data?

--Mary


On Tue, Aug 4, 2015 at 5:07 PM, Sam McClatchie (NOAA Federal) <
sam.mcclatchie at noaa.gov> wrote:

> 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
> --
> 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> <Sam.McClatchie at noaa.gov>
> Office: 858 546 7083, Cellular:  858 752 8495
> Research home page <www.fishocean.info>
> [image: CalCOFI 66 years]
>
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