[gradsusr] cress man analysis

[Chinh ta huu]

Dear all

I am trying to use cress man scheme in grads. So I have a problem like this:

script is accompanied in attached file

ga-> oacres2.gs
No hardcopy metafile open
All files closed; all defined objects released;
All GrADS attributes have been reinitialized
Warning from OACRES:  Less than two stations
    Grid will be all missing values
Cannot contour grid - all undefined values
Cannot plot color bar: No shading information
No hardcopy metafile open
GX package terminated

Any one please help me to fix
Thank you very much

-- 
(Mr.) Ta Huu Chinh
National, Weather Forecasting Center, Ha Noi, Viet Nam.
No: 4th, Dang Thai Than, Hoan Kiem, Ha Noi
Tel: 84-903-298-856
Office: 84-43-824-4917
Email: chinhth2010 at gmail.com
Website: http://vn.myblog.yahoo.com/chinhth2005/
Website: http://bestknowledge-chinhth.blogspot.com/
Website: http://anhcuoidep.vn
-------------- next part --------------
A non-text attachment was scrubbed...
Name: oacres2.gs
Type: application/octet-stream
Size: 328 bytes
Desc: not available
Url : http://gradsusr.org/pipermail/gradsusr/attachments/20130108/ab1e7433/attachment-0003.obj