How to make composite plots

[sushant puranik]

Thank you for hint.
I tried
d (ave(var,t=1,t=360,12)+ave(var,t=2,t=360,12)+ave(var,t=3,t=360,12))/3
after that i checked the result it gives average of three days only not for
three months.

Since i has ECMWF data at 6 hour interval in the monthly form (each file
contain 1 month data).
So i tried as per your suggestion but it gives ave of first three days of
first file only and not for the three years file.

Also i am facing the following problem

[Sushant at localhost ~]$ gradsnc

Grid Analysis and Display System (GrADS) Version 1.8SL11
Copyright (c) 1988-2001 by Brian Doty
Center for Ocean-Land-Atmosphere Studies
Institute for Global Environment and Society
All Rights Reserved

Config: v1.8SL11 32-bit little-endian readline sdf/xdf netcdf lats printim

Issue 'q config' command for more information.

Landscape mode? (no for portrait):
GX Package Initialization: Size = 11 8.5
ga-> c
*ga-> sdfopen /home/Sushant/Desktop/ECMWFdata/May2002data/u.nc *
Scanning self-describing file:  /home/Sushant/Desktop/ECMWFdata/May2002data/
u.nc
Found 1 data variables in SDF file.
Found displayable variable u with 29 levels in SDF file.
SDF file /home/Sushant/Desktop/ECMWFdata/May2002data/u.nc is open as file 1
LON set to 0 360
LAT set to -90 90
LEV set to 50 50
Time values set: 2002:5:1:0 2002:5:1:0
*ga-> sdfopen /home/Sushant/Desktop/ECMWFdata/May2001data/u.nc *
Scanning self-describing file:  /home/Sushant/Desktop/ECMWFdata/May2001data/
u.nc
Found 1 data variables in SDF file.
Found displayable variable u with 29 levels in SDF file.
SDF file /home/Sushant/Desktop/ECMWFdata/May2001data/u.nc is open as file 2
ga-> set lev 1000
LEV set to 1000 1000
ga-> d u
Contouring: -20 to 20 interval 5
ga-> c
ga-> d u.2
*Data Request Warning:  Request beyond file limits
  Entire grid contents are set to missing data
  Dimension ranges are:  X = 1 240  Y = 1 121  Z = 29 29  T = 1461 124
  Warning issued for variable = u.2
Cannot contour grid - all undefined values *
ga-> c

Now can you please solve this problem.



Thank you again


Sushant


On Tue, Sep 22, 2009 at 5:50 PM, Yan Libin <zjuyanlibin at 163.com> wrote:

>  d ave(var,t=1,t=360,12)
>
> d (ave(var,t=1,t=360,12)+ave(var,t=2,t=360,12)+ave(var,t=3,t=360,12))/3
>
>
> 2009-09-22
> ------------------------------
>  Yan Libin
> ------------------------------
> *发件人：* sushant puranik
> *发送时间：* 2009-09-22  20:18:04
> *收件人：* GRADSUSR
> *抄送：*
> *主题：* How to make composite plots
>  Hello sir
> I wish to make composite plot for 20 year period for each month (monthly
> mean composite) and also want to make composite for season (seasonal
> composite)(Dec-March).
> Can you please give me help in this regard.
>
>
> Thanking you
>
> Sushant
>
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