[ferret_users] modify argument list of a variable (e.g. SSH)

[Haoping Yang <Haoping.Yang@xxxxxxxx>]

Dear ferreters,

Here I use a simple example to describe my problem. A netcdf dataset 
OLD.nc contains:
------------------------------------------------------------
dimensions:
       Longitude = 271 ;
       Latitude = 193 ;
variables:
       float Longitude(Longitude) ;
       float Latitude(Latitude) ;
       float SSH_OLD(Latitude, Longitude) ;
------------------------------------------------------------
yes? use OLD.nc
yes? show data
    currently SET data sets:
   1> ./iarchv.2011_001_00_2d.nc  (default)
name     title       I         J         K         L
SSH      SSH         1:271     1:193     ...       ...


Now I wanna use ferret to generate a new netcdf file NEW.nc with a new 
list of arguments for the variable SSH. I mean I want to simply express 
SSH as a function of iaxis (1,2,3,...,271) and jaxis(1,2,3,...193) to 
replace SSH_OLD(Latitude, Longitude):
------------------------------------------------------------
dimensions:
       iaxis = 271 ;
       jaxis = 193 ;
variables:
       int iaxis(iaxis) ;
       int jaxis(jaxis) ;
       float SSH(jaxis, iaxis) ;
------------------------------------------------------------

I tried to use the section below but it doesn't work and gives me a file 
with wrong data.
yes? define axis/x=1:271:1 iaxis
yes? define axis/y=1:193:1 jaxis
yes? define grid/x=iaxis/y=jaxis new_grid
yes? let SSH=SSH_OLD[d=1,g=new_grid]
yes? save/file="NEW.nc" SSH

Can anyone show me a few ferret scripts that might be able to get the 
expected NEW.nc?

Many thanks!

Haoping