[gradsusr] Computing Mean

[Maria Tembo]

I have a question which seems kind of easy, but right now my brain canot figure this out. I have a file with 10yrs and 3 months ie, 1980-1990 for May, June, July. When i use 

ga> ave(lon,lat).. what is computed is an average for all the 30 time steps, which is ok

But what do i do then if i want to average everything in this particular file to get only one mean, in terms of lat and lon such that i can draw a spatial map?

Thanks in advance for the valued responses
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