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[ferret_users] ffta of a filtered signal in ferret
- To: fer_faq <oar.pmel.ferret_users@xxxxxxxx>
- Subject: [ferret_users] ffta of a filtered signal in ferret
- From: Sudheer Joseph <sjo.india@xxxxxxxxx>
- Date: Thu, 08 Apr 2010 18:09:56 +0530
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Dear Users,
I wanted to do the below steps in ferret but as the ffta gives out an error though I specify only portion of the time axis where there is data after the removal during filtration, May this be due to the fact that the computation for filter and ffta are taking place simultaniously and there fore the end points available to ffta do not have datat there?
is there a way to do this computation other than listing the results to a file and reading that again to a new time axis?
use monthly_navy_winds
let aa = uwnd[i=50,j=20]
let az = aa - aa[t=@ave]
plot az
plot/over lanczos(az, 0.05, 0.1, 11)
plot/over lanczos(az, 0.1, 0.2, 11)
let nts=lanczos(az, 0.1, 0.2, 11)
% both ends of the timeseries are lost due to filter.
plot ffta(nts[l=6:127])
Bailing out of external function "ffta":
FFTA encountered missing data at (i,j,k,l) 50 20 -999 1
**ERROR: error in external function
plot ffta(nts[l=6:127])
--
with best regards
Sudheer
**********************************************************************************
Sudheer Joseph
Scientist
Indian National Centre for Ocean Information Services (INCOIS)
Ocean Valley, Post Box No# 21,
IDA Jeedimetla P.O.
Hyderabad, Ranga Reddy District - 500 055
Andhra Pradesh, India.
TEl:+91-40-23044600(R),Tel:+91-9440832534(Mobile)
Tel:+91-40-23886047(O),Fax:+91-40-23892910(O)
E-mail:sjo@xxxxxxxxxxxxxx; sudheer.joseph@xxxxxxxxx; sjo@xxxxxxxxxxxxx.
Web- http://oppamthadathil.tripod.com
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