Re: low-pass filter

>hi, users
> thanks the people who help me.
>
>a low-pass filter is imposed on annual global_mean
>time series temperature change data ,which removes
>fluctuations with periods less than 10 years(11-point smooth).
>
>i use the function
> wgt = filwgts_lancos (9, 0, 0.2, -999., 1)
>to get the wgts, and use
> ts = wgt_runave(ts(time|:), wgt, 0)
>to get the smooth data.
>but how to know the data is 11-point smooth?
>yours sherry
======================

I know this question has been answered
  http://www.ncl.ucar.edu/Support/talk_archives/2006/0864.html

This response focuses upon filtering.
  
Perhaps, I do not understand. You want a filter that
"removes fluctuations with periods less than
 10 years(11-point smooth)". Then you specify
 
 wgt = filwgts_lancos (9, 0, 0.2, -999., 1)
                       ^ ^^^
                       
This is a nine [9] point smoother with an idealized cutoff
at 0.2 cycles/year [ie: 5 years]
        
  

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Received on Wed Aug 30 2006 - 14:55:12 MDT