Re: how to average months and then make the time series

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Yogesh,
To get the series of three-month averages you need to define a new
time axis whose coordinages are every third point of the existing time
axis.  Then regrid your variable to that axis using the @AVE regridding
transformation.

       ! This is a list of the time points you want to use
    yes? let timepoints = t[GT=CO2,t=2:48:3]

       ! Define a new time axis having the same time origin and coordinates
       ! at the list of timepoints

    yes? define symbol time_origin = "`CO2,RETURN=T0`"
    yes? define axis/T/T0=($time_origin)  time_3 = timepoints
    yes? show axis time_3

    yes? let C02_ave = CO2[GT=time_3@AVE]



Yogesh K. Tiwari wrote:

> Dear Ferret Users,
>
> I have netcdf data looks like :
>
>
> --------------------------------------
> currently SET data sets:
>     1> ./concat_tovs_data.cdf  (default)
>
> name     title                   I         J         K         L
>
> CO2      CO2 concentration      1:360     1:180     ...       1:49
> ---------------------------------------
>
> The data is on monthly interval.
>
>
>
> Now if I run the following script :
>
> *********************
> *********************
> use concat_tovs_data.cdf
>
> set window/size=0.9
> set window/aspect=1.7
> ppl AXLSZE , 0
>
> plot/nolab/vlim=300:360:5    CO2[x=@ave,y=25:20@ave,l=1:49]
> plot/nolab/vlim=300:360:5/ov CO2[x=@ave,y=20:15@ave,l=1:49]-5
> plot/nolab/vlim=300:360:5/ov CO2[x=@ave,y=15:10@ave,l=1:49]-10
> plot/nolab/vlim=300:360:5/ov CO2[x=@ave,y=10:5@ave,l=1:49]-15
> plot/nolab/vlim=300:360:5/ov CO2[x=@ave,y=5:0@ave,l=1:49]-20
> plot/nolab/vlim=300:360:5/ov CO2[x=@ave,y=0:-5@ave,l=1:49]-25
>
> ************************
> *********************
>
> ferret plots the nice time series month by month ordered by 5 degree 
> latitude interval.
>
>
> Now what I want to do next :-
>
> First I want to average each three month and then I want to plot three 
> monthly averaged time series. Average something like following :
>
> l=1:3@ave
> l=4:6@ave
> l=7:9@ave
> ........
> .....
> ..
> l=47:49@ave
>
>
>
>
> Therefore how to average first three month and then next three month and
> then next ..............  and then plot the above time series.
>
>
> Kindly help!!!!!!!!!!!!!
>
>
> Thanks in advance,
>
> Regards,
> Yogesh