How to convert 3 hourly data into a 6 hourly data?

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Arun Nair 2019-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/462657-how-to-convert-3-hourly-data-into-a-6-hourly-data

评论： Arun Nair 2019-5-19

I have a 3D variable (time,latitude,longitude) every 3hourly (regular). I need to change this variable into 6 hourly by averaging (eg, 0hr and 3hr of old variable averaged, and stored as first time step in the new variable). In total my old variable has 56 time steps. How should I go about?

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采纳的回答

Andrei Bobrov 2019-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/462657-how-to-convert-3-hourly-data-into-a-6-hourly-data#answer_375485

编辑：Andrei Bobrov 2019-5-18

在 MATLAB Online 中打开

In R2016b

[m,n,k] = size(A);
t = hours(0:3:(k-1)*3);
Ar = reshape(A,m,[]);
TT = table2timetable(array2table(Ar),'RowTime',t(:));
T1 = retime(TT,TT.Time(1:2:end),'mean');
out = reshape(T1{:,:},[],n,k);

add:

[m,n,k] = size(A);
t = hours((0:m-1)*3)';
o1 = varfun(@mean,array2table([floor(t / hours(6)) + 1,reshape(A,m,[])]),...
                                                 'GroupingVariables','Var1');
out = reshape(o1{:,3:end},[],n,k);