hourly average of multiple column data

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navan
navan on 12 May 2016
Commented: Star Strider on 13 May 2016
I have made a code to calculate hourly average of minute data. But it works only for single column. I have multiple column of concentration (BC) data. I want hourly average of multiple columns How can i get the desired answers. pls help.
day1bc=BC(find((date==1)));
day1hour=hour(date==1);
maxday1=max(day1hour);
for i=1:maxday1
HI= find(day1hour==i);
Bcv=day1bc(HI);
mean_BC_hourly1(i,:)=mean(Bcv);
end
The input datas are:
day hour BC BC;
1 1 10 20;
1 1 20 40;
1 2 30 60;
1 2 40 80;
1 3 50 100;
1 3 60 120;
1 3 70 140;
The answer expected:
BC BC;
15 30;
35 70;
60 120;

Accepted Answer

Star Strider
Star Strider on 12 May 2016
Use accumarray for the hours, although you would have to loop over the days:
% day hour BC BC
Mtx = [ 1 1 10 20;
1 1 20 40;
1 2 30 60;
1 2 40 80;
1 3 50 100;
1 3 60 120;
1 3 70 140;];
% ‘for’ % LOOP OVER DAYS
out(:,1) = accumarray(Mtx(:,2), Mtx(:,3), [], @mean);
out(:,2) = accumarray(Mtx(:,2), Mtx(:,4), [], @mean);
% ‘end’ % LOOP OVER DAYS
In the loop over days, replace the ‘:’ in the ‘out’ array reference with the day number.
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