size reduction and addition operator

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Hernaldo Leyton 2016-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/284677-size-reduction-and-addition-operator

评论： the cyclist 2016-5-18

I have a file with 5 dimensions netcdf, longitude, latitude, levels, days and hours of pollutant emissions (224x178x7x7x24). I need to add (sum) all emissions of every hour of every day and all levels and also reduce the dimension of five to two dimensions. As a result I should be a matrix of latitude and longitude data combined emissions of the last three dimensions of netcdf file. Do I can indicate what form please? First of all, Thanks

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Answer 1

the cyclist 2016-5-18

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I'm not sure I understand, but does this code do what you want?

% Some pretend data
netcdf = rand(224,178,7,7,24);
% Sum over each dimension in turn
sum5 = sum(netcdf,5);
sum4 = sum(sum5,4);
sum3 = sum(sum4,3); % This contains the sum for each lat/long.

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Answer 2

the cyclist 2016-5-18

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If the other answer I submitted is what you intended, you can get the same thing with the following one-liner:

% Some pretend data
netcdf = rand(224,178,7,7,24);
sum3 = sum(reshape(netcdf,224,178,[]),3);

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Hernaldo Leyton 2016-5-18

Thanks very much.

It was just what I needed

Regards

the cyclist 2016-5-18

The best form of thanks is upvoting and/or accepting answers that are helpful. This rewards the contributor, and can point other users to helpful answers.

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