How do I take average of lat long data of a NetCDF file? Facing problem!

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Lavnish Gupta
Lavnish Gupta 2018-5-21
评论： KSSV 2018-5-21
I am having a NetCDF file with sst variable. I have an array named sstdata which is a 1440x168x289 double. (long x lat x time). I need to take domain average of sstdata so that it only varies with time to get a average plot w.r.t time. I have written the following code:
k=0;
for m=drange(1:1440)
for n=drange(1:168)
k=k+sstdata(m,n,:);
end
end
k=k./1440;
k=k./168;
But I am getting only a 1 x 1 x 289 double which only has NaN and zeros as its values. Is there anything wrong with the code? Please help!

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回答（1 个）

KSSV
KSSV 2018-5-21
Read about mean. You read the whole variable of size 1440x168x289 into workspace and use mean. mean accepts dimensions...you have to use mean on third dimension.
sst = ncread(filename,'variable') ; %read sst data here
iwant = mean(sst,3) ;
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