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[ferret_users] filters

Dear ferret users,

I am using ferret function LANCZOS (filter), band-pass filter for analysising a time series data (trition buoy data) for identifying 6-30 days and 30-90 day intraseasonal oscillation. The data is daily and I have 360 days of the data

I am not able to understand how ferret is selecting the weights.

May I request for some needy help!!!

How to select correct weights in using the filter.

Ex :!for 30-90days
plot lanczos(az,0.0111,0.033,91) or plot/over lanczos(az,0.0111,0.033,61) shows lot of difference.

I have some confusion  in understanding the funtion application.

with regards,

 Dr. C.Kalyani Devasena                Phone : +91 80  25051904, 25051905.
 Project Scientist                      Fax 91-80-25220392
 CSIR Centre for Mathematical-           E-mail: kalyani@xxxxxxxxxxxxxxx
 Modelling and Computer Simulation (C-MMACS)
 NAL Belur Campus,
 Bangalore - 560 037,

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