averaging
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I have a matrix composed of 12 columns representing depths from 1 to 12 and I have thousands of rows which represent 2 minute intervals at which the measurements were taken. how could I change the values to show hourly averages? As in average every 30 rows! I've tried using reshape to do this but cant get my head around it.
thanks
回答（3 个）
Andrei Bobrov
2011-11-9
d=randi(127,90,12);
out = squeeze(mean(reshape(d.',size(d,2),30,[]),2)).';
or
n = 30;
a = zeros(size(d)./[n 1]);
k1 = (n-1:-1:0);
for j1 = 1:size(d,1)/n
k = j1*n - k1;
a(j1,:) = mean(d(k,:));
end
or 2
out2 = blockproc(d,[30, size(d,2)],@(block_struct)mean(block_struct.data))
Fangjun Jiang
2011-11-9
d=rand(90,12);
[M,N]=size(d);
e=mat2cell(d,30*ones(M/30,1),N);
f=cellfun(@mean,e,'uni',false);
g=cell2mat(f);
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