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How to calculate average of Netcdf daily data

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sunny kant
sunny kant 2015-4-15
回答： Chad Greene 2015-4-16
I am able to read the netcdf file format. But how to calculate average? Suppose I have to calculate the average from 1st January to 31st January, then again 1th Feb. to 26th Feb. and so on.....Below is the program to read the values. and also attaching the data sets
%% New Program for Wind Vector data=netcdf.open('uwnd.sig995.2014.nc','NC_NOWRITE'); data1=netcdf.open('vwnd.sig995.2014.nc','NC_NOWRITE');
ug=netcdf.getVar(data,3,[0 0 0],[144 73 1],'double'); vg=netcdf.getVar(data1,3,[0 0 0],[144 73 1],'double'); lat1 = netcdf.getVar(data,0,0,73); lon1 = netcdf.getVar(data,1,0,144); ind = find(ug==9999); ug(ind) = NaN; vg(ind) = NaN; % end
[Lat, Lon] = meshgrid ( lat1, lon1 ); ws=sqrt(ug.^2+vg.^2);
% figure magnification
m_proj('Mercator','lon',[65 100],'lat',[5 40],'rect','on'); % Making projection % m_pcolor(Lon,Lat,ws); m_coast('patch',[.6 1 .6],'edgecolor','none'); m_grid('tickdir','out','yaxislocation','right',... 'xaxislocation','top','xlabeldir','end','ticklen',.02);
hold on
m_contourf(Lon,Lat,ws)
% m_plot(Lon,Lat,'color','k','linewidth',2.5);
m_quiver(Lon,Lat,ug,vg,50,'k');
hold off

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回答（1 个）

Chad Greene
Chad Greene 2015-4-16
You can use downsample_ts. Syntax would be
ug_monthly = downsample_ts(ug,t,'monthly','mean');

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