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<body class='hmmessage'><div dir='ltr'>Hello grads users,<br><br>i'm fairly new using grads. I have a netcdf file that contains monthly mean data of zonal wind from 1871 to 2010, and i need to obtain individual mean values for each month for a given region (volume).<br><br>i was using the amean function, but a can only get a value of an area, and when i modify the lev parameter i get an error message, like this:<br><br>set lev 1000 700<br>a=amean(uwnd, lat=0, lat=25, lon=260, lon=300)<br><br>then i tried nesting various mean functions like this:<br><br>a=mean(mean(mean(uwnd,lat=0,lat=25),lon=260,lon=300),lev=1000,lev=700)<br><br>and i get a result, but i don't know if this is correct. Is this the right way to do it, or are there other ways?<br><br>Hope you can help me. Thanks in advance.<br><br>Alejandro.<br><br><em><font color="#ff0000" face="Garamond, Times, Serif " size="4"></font></em> </div></body>
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