time average

[tanusri chakraborty]

I want do to time average of two variable from to different nc file.I have done like this,given 
set dfile 1
ave(olr.1,t=1,t=24)
set dfile 2
ave(uwnd.2,t=1,t=24)
but it  is the showing error like is-----Request is outside file limits
How to slove the problem 
Please help me
 


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