Calculate mean from daily to monthly values.

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lreplo
lreplo 2015-7-21
评论： lreplo 2015-7-22
Below is the code I have so far. It only spits out year 2014 month 12 mean. I need monthly means for all years. So there should be 84 values.
[y,m,d] = datevec(dn);
for j = [2008:2014]
for i= [1:12]
idx=find(y==j&m==i);
meandata1=mean(swh(idx));
meandata(84,:)=[84 meandata1];
end
end
Thank you in advance

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Azzi Abdelmalek
Azzi Abdelmalek 2015-7-21
编辑：Azzi Abdelmalek 2015-7-21
dn=datenum('01-01-2008','dd-mm-yyyy'):datenum('31-12-2014','dd-mm-yyyy')
swh=randi(10,numel(dn),1)
[y,m,d] = datevec(dn);
a=[y' m' d']
[ii,jj,kk]=unique(a(:,1:2),'rows')
out=accumarray(kk,(1:numel(kk))',[],@(x) mean(swh(x)))
  2 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2015-7-21
If you want to correct your for loop
k=0;
for j = [2008:2014]
for i= [1:12]
k=k+1;
idx=find(y==j&m==i);
out1(k)=mean(swh(idx));
end
end

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