[ncl-talk] bandpass filter issue

[Dennis Shea]

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> 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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