[ncl-talk] bandpass filter issue

[Xi Chang]

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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