[gradsusr] Missing or Invalid Arguments for prnopts option

[Siti Saleha]

Dear All, How can I extract u & v wind magnitude as time series using Grads. I try this code,  as I set prnopts  error come out as "missing or Invalid Arguments for prnopts option". I am not familiar with prnopts, What should I add? I'm using windows 7. Please guide me. Thank you.set lat 6 set lon 120set t 1 92set gxout printset prnopts %6.2 f 1 1d mag(u,v)a= sublin(result,2) b= subwrd(a,1)res=write('data.txt',time' 'b,append)
-Siti
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