[gradsusr] How to regrid data using GrADS

[Hang]

Hi,

I want to regrid my data and I am using GrADS Version 2.0.a3 (not opengrads in 
windows). I have tried
 "regrid(uwnd,2.5,2.5)"   ,   " regrid2(uwnd,2.5,2.5)"       and   
 "re(uwnd,2.5,2.5)" . 

However error messages were displayed and said 
'regrid' not a variable or function name   , 'regrid2' not a variable or 
function name    and 're' not a variable or function name        
respectively

Does anyone have any ideas on how to regrid data using GrADS and give me some 
suggestions? Which command should I use? 
Your suggestion is highly appreciated.

Thanks
Henry

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