[gradsusr] How to use while loop in Grads

[Ali Imran]

I Have download snow data from JRA for years 1979-20210.Data of each month has a different cotrol file.So while loop is needed to draw that data through  Grads. 
 How I can use while loop for this data & what should be the structure of that loop.
 
                                                                                                                 Ali
                           


      
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