griding of ASCII data file for the meridional mean

["Yogesh K. Tiwari" <ktiwari@xxxxxxxxxxxxxxx>]

Hello,

I am using ferret v5.80 on Suse Linux.

I have airplane CO2 obsercations  in ASCII format.

The whole data spans between latitude -40 to +40.

I want to take the 5 degree latitudional mean of 
whole data.

I tried to write a small script and I defined the 
axis as following :-

define axis/x=1:360:1 xlon

define axis/y=1:180:1 ylat

define axis/t=1:13792:1 time

define grid/x=xlon/y=ylat/t=time newgrid

file/var="time,lat,lon,ht,co2"/grid=newgrid\ data.txt

Ferret complains while using the command for the 
plot :-

**ERROR: stack overflow
*** NOTE: Check for recursion in variable definitions


The airplane observations are of many months and 
the latitude is not in monotonic increasing order
i.e. observations are irragular.

Kindly suggest me how I can define the axis so I 
can grid the data to take the 5 degree meridional 
mean.

Or simply, how one can grid , defile axises of any 
ASCII data format which has irragular observations.

This will really help to take the means of either 
zonal or meridional if the data amount is really much.

Many thanks for your help.

Regards,
Yogesh

--

===========================================
Yogesh Tiwari,
Max-Planck Institute for Biogeochemistry,
Hans-Knoell Strasse 10,
D-07745 Jena,
Germany

Office   : 0049 3641 576 376
Home     : 0049 3641 223 163
Fax      : 0049 3641 577 300
Cell     : 0049 1520 4591 008
e-mail   : yogesh.tiwari@bgc-jena.mpg.de
===========================================