[ncl-talk] bandpass filter issue

[Xi Chang]

Thanks for the reply. No i dont use it, since what i need is how to
extract/filter the daily data having frequency 1/16 day. is it possible to
only use bandpass filter?




On Tuesday, 6 October 2015, Dennis Shea <shea at ucar.edu> wrote:

> Are you looking a 'complex demodulation" ???
>
> If so, that is in the 6.3.1 release:
>   http://www.ncl.ucar.edu/future_release.shtml
>
> Click 'demod_cmplx'  =>
> http://www.ncl.ucar.edu/Document/Functions/Contributed/demod_cmplx.shtml
>
> See Examples at the bottom of
> http://www.ncl.ucar.edu/Applications/spec.shtml
>
>
> On Mon, Oct 5, 2015 at 4:32 PM, Xi Chang <xi.chang01 at gmail.com
> <javascript:;>> wrote:
> > Hi NCL,
> >
> > I have daily data 10 years. I'd like to filter the data at frequency
> (1/16)
> > day. To do so what the most appropiate  frquency ranges that i have to
> use
> > ?, is it domething like fa=1/15 and fb=1/17 ?
> > I aware if the band is too narrow the filtered signals are fake
> /artificial
> > (i tesed with ncl butterwooth and the filtered results are weird) ? is
> there
> > any idea how to do that appropriately? do i need to use hourly data
> instead
> > of daily?
> >
> > Thanks
> >
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>
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