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How do I take the average of every n values in a matrix?

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roberto ivan perez luna
编辑： Matt J 2017-12-2
hello again, i have one a2_dap_U 17567x71x42 double value matrix; 17567=values every 30 min, 71x42 grid.
so i tried this one for the 24 hour average (48 since its every 30 min):
a2_dap_U_24=arrayfun(@(i) nanmean(a2_dap_U(i:i+48-1)),1:48:length(a2_dap_U)-48+1)';
but it gave me 365 NaN values, and i dont know how to do it, since this command line help me with individual values that i extracted from two sites within the 71x42 matrix, but it doesnt help me for the whole 17567 values for the whole matrix.
any help please ;)

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回答（1 个）

Matt J
Matt J 2017-12-2
编辑：Matt J 2017-12-2
a2_dap_U(17568,:,:)=nan; %pad to even multiple of 48
A=nanmean(reshape(a2_dap_U,48,[]));
B=reshape(A,[],71,42);

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