hourly average of multiple column data

Question

navan 2016-5-12

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https://ww2.mathworks.cn/matlabcentral/answers/283934-hourly-average-of-multiple-column-data

评论： Star Strider 2016-5-13

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  10  20;
1  20  40;
2  30  60;
2  40  80;
3  50  100;
3  60  120;
3  70  140;

The answer expected:

BC   BC;
30;
70;
120;

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Answer 1

Star Strider 2016-5-12

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在 MATLAB Online 中打开

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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Star Strider 2016-5-12

在 MATLAB Online 中打开

This works for the day loops. Note that the first three rows are for day #1 and the last two rows are for day #2. I added a ‘time’ array to keep track of them if you need to do that:

Mtx = [ 1  1  10  60;
        1  1  10  60;
        1  2  20  80;
        1  2  20  80;
        1  3  30  100;
        1  3  30  100;
        1  3  30  100;
        2  1  40  120;
        2  1  40  120;
        2  1  40  120;
        2  2  50  140;
        2  2  50  140;
        2  2  50  140;
        2  2  50  140;
        2  2  50  140];
dv = unique(Mtx(:,1));                                                              % Unique Days
for k1 = dv(:)'
    avg{k1,1} = accumarray(Mtx(Mtx(:,1)==k1,2), Mtx(Mtx(:,1)==k1,3), [], @mean);    % BC1 Mean
    avg{k1,2} = accumarray(Mtx(Mtx(:,1)==k1,2), Mtx(Mtx(:,1)==k1,4), [], @mean);    % BC2 Mean
    hr = accumarray(Mtx(Mtx(:,1)==k1,2), Mtx(Mtx(:,1)==k1,2), [], @mean);           % Hours
    time{k1} = [k1*ones(size(hr)) hr];                                              % [Days Hours]
end
Result = [cell2mat(time') cell2mat(avg)]  
Result = 
     1     1    10    60
     1     2    20    80
     1     3    30   100
     2     1    40   120
     2     2    50   140

The ‘Result’ array concatenates the ‘time’ and ‘avg’ arrays (that I renamed to make them more meaningful).

navan 2016-5-13

Dear Star Strider Thanks again. It helped me so much. Thank you for your precious time ,effort and great help

Star Strider 2016-5-13

As always, my pleasure!

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