Hi -A good way to find things in the Ferret Users Guide is to load the Index into your browser,
../../documentation/users-guide/index and search for the words you want in there.To do an average in X and Y, look at the index entry "average, transformation @AVE", where there are examples of the kind of thing you want to do.
For making an annual mean from data on a monthly time axis, you will define a time axis with units of a year, and use a regridding transformation to put your area-averaged variable onto that new time axis. You could use viewports to show both the monthly and yearly time series together (set view upper; plot monthly_variable; set view lower; plot yearly_variable). I'll let you work out the details and if you have questions once you've made a start, please feel free to write back to the list.
Ansley On 5/24/2010 1:50 PM, C. Shaji wrote:
Dear all,
I am interested to get a time series plot of monthly and annual mean SST
using multi-year SST field. There is only one data file conatining all
time levels data.
Please see the data info below.
yes? show grid
Default grid for DEFINE VARIABLE is ABSTRACT
Last successful data access was on grid GEU1
GRID GEU1
name axis # pts start end
LON LONGITUDE 360mr 0.5E 0.5W
LAT LATITUDE 180 r 89.5S 89.5N
LEV HEIGHT (millib 1 r- 1 1
TIME TIME 311 i 01-DEC-1981 00:00 01-OCT-2007 00:00
yes? show data
currently SET data sets:
1> /users/cshaji/NOW/sst_mon_81_07.nc (default)
name title I J K L
SST ** monthly from december 1981 ( 1:360 1:180 1:1
1:311
First I want to get an area (x=30E:78E,y=5N:31N) average of SST. Then plot
the time series of the area-averaged monthly as well as annual mean SST
for the time period from l=2 to l=301 only (covering January 1982 to
December 2006) in the same figure window.
I could not find any demonstration on this.
I would highly appreciate if somebody please give me some suggestions.
Thanks in advance
Shaji.