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sum of values in matrix with a loop

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zhi cheng
zhi cheng 2022-10-15
回答： Jan 2022-10-15
given a 52560 x 8 double
where the first 5 columns are [ year month day hour minute ], and next 3 columns are speed of 3 different object
the data is recorced with a gap of 10 minutes
therefore, to get the same time value, I know that its row 1 and row 145 (24hours after row 1)
so, I need to sum all the speed with same time, eg
speed of A at 2022 10 15 11 10 = 3.5
speed of A at 2022 10 16 11 10 = 4.5
....
then the avg speed of A at time 11 10 = (3.5+4.5+...)/n
speed of B at 2022 10 15 11 10 = 100
speed of B at 2022 10 16 11 10 = 200
then the avg speed of B at time 11 10 = (100+200+...)/n
X=zeros(1,3);
for i = 1:length(outDates(:,5))
avgspeeds = zeros(1,3);
for j = 1:3
sum1 = outDates(i,5+j) + outDates(i+144,5+j)% 144 to get the next same time value(24hours after previous value)
end
end

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回答（1 个）

Jan
Jan 2022-10-15
outDates = rand(52560, 8); % Arbitrary test data
X = reshape(outDates(:, 6:8), 144, [], 3);
Y = squeeze(sum(X, 2) / size(X, 2)); % Mean over 2nd dimension

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