How to find yearly mean for multiple netcdf files having monthly means?

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sravanthi mopati
sravanthi mopati 2018-3-8
编辑： sravanthi mopati 2018-3-8
I have era 20cm datasets. Each subdataset has monthly means of 10 variables of a particular region of interest. the datasets are 3 dimensional - latitude, longitude and time. the dimensions of latitude and longitude are different. i have gone through the following question:
https://in.mathworks.com/matlabcentral/answers/371225-calculate-daily-monthly-annual-averages-from-hourly-data%20
used "accumarray"..commands are as shown below
precJanuary = netcdf.getVar(ncid1,3,[0 0 0],[225 82 1]);
yearlyaverage = accumarray(id, precJanuary, [], @mean);
Getting the following error: Second input VAL must be a vector with one element for each row in SUBS, or a scalar.
I have to calculate yearly means for all variables. Any suggestions in this regard will be helpful. A sample dataset can be found at:
https://drive.google.com/open?id=1OXPjG8pb9Yslqz_NvILLsoEq9VhaNR3u

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