How I can perform a loop in order to calculate multiple means in a matrix based on multiple values?

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Miguel L
Miguel L 2017-11-8
评论： Andrei Bobrov 2017-11-9
Hello Matlab community! I am learning how to perform loops!
I am working with multiple years of meteorological information, and I would like to perform a loop in order to compute the mean by each hour of record, and after that concatenate every result in a single matrix. I have to say that the records are at hour 0, 3, 6, 9, 12, 15, 18 and 21.
I have been working in the next code, but without results:
m3=zeros(8,100);
interval=0:3:21; %these are the hours which the mean would be calculated
for i=1:8
XMINHOUR(i)=XMIN(find(XMIN(:,1) == interval(i)),:);
D_0(i)=XMINHOUR;
m3=mean(D_0);
end
I have attached to the present message the data (variable XMIN)
Thanks in advance for your support!
Miguel
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Andrei Bobrov
Andrei Bobrov 2017-11-8
编辑：Andrei Bobrov 2017-11-8
>> [g,v] = findgroups(XMIN(:,1));
>> out = splitapply(@mean,XMIN,g);
or
[ii,jj] = ndgrid(findgroups(XMIN(:,1)),1:size(XMIN,2));
out = accumarray([ii(:),jj(:)],XMIN(:),[],@mean);
  2 个评论
Miguel L
Miguel L 2017-11-8
Hello Andrei!
I really appreciate your help! But I wanna ask you if there is an equivalent of "findgroups" or "splitapply" commands for MATLAB 2011 (my current version).
Best,
Miguel

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