Running average over time

[Charles Seman]

Jason,

Here is part of an email exchange to the Listserv (originally posted by
Alvaro Luis <luis at OCEAN.CAOS.TOHOKU.AC.JP> ; Arlindo da Silva answered...):
-------------------------------------------------------------------------------------------------------------------------------
 >
 >       Has anyone tried computing a centered running mean in GrADS
 > environment? The one which I know positions the running mean starting
on the
 >  first point:
 >
 > set t 1 365
 > define a=ave(var,t+0,t+6)   ! for a 7-day running mean
 >
 >
 > I wish to position this one on day=3 and not on day=1. How to achieve
this?
 >

Try:

set t 4 365
define a=ave(var,t-3,t+3)   ! for a 7-day running mean


You can still use

set t 1 365
define a=ave(var,t-3,t+3)   ! for a 7-day running mean

but in this case you willl get an uncentered mean for the first
3 days.

--
Arlindo da Silva
arlindo at niteroi.gsfc.nasa.gov

-------------------------------------------------------------------------------------------------------------------------------

I hope this helps,
Chuck

Jason Snyder wrote:

>I was wondering if any of you know about how to do plot a running time
>average in a time series.  For example how to plot for 100 years a 5 year
>running average of sea surface temperatures over a particular region.
>
>Thanks,
>
>Jason
>
>

--

********************************************************************
 Charles Seman                                Charles.Seman at noaa.gov
 Geophysical Fluid Dynamics Laboratory / NOAA
 Princeton University                          voice: (609) 452-6547
 P.O. Box 308                                    fax: (609) 987-5063
 Princeton, NJ  08542-0308            http://www.gfdl.noaa.gov/~cjs/
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