How to loop around cumsum ?
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Hello,
I have a file 3600x601 and I would like to obtain a file 1x601 where each 601 value in the new file is the cumulative sum of the associated 3600 values.
I have written this:
for i =1:601
Csflux = cumsum(Flux(i,:));
end
where Flux is 3600x601
At the end I have Csflux 1x601 but it's the cumulative sum of each 601, so it's not what I want.
Do you have any ideas?
I am working on a current fluxes in a coral reef :)
1 个评论
James Tursa
2020-6-3
编辑：James Tursa
2020-6-3
Please show a small example. E.g., show a specific 5x3 input and the desired output.
回答（1 个）
Image Analyst
2020-6-3
Did you just want the sum of each column? Like this:
columnSums = sum(Flux, 1);
2 个评论
Lea Enguehard
2020-6-3
Image Analyst
2020-6-4
Lea, we still don't know what you mean, in spite of James and I asking for more clarification or an example. By the way, is this homework?
Is this what you mean?
% Create small test data set.
Flux = randi(9, 5, 15);
columnSums = sum(Flux, 1);
cSums = zeros(size(Flux)); % Preallocate space.
for column = 1 : size(Flux, 2)
thisCumulativeSum = cumsum(Flux(:, column)) % Let's see it first (optional).
cSums(:, column) = thisCumulativeSum
end
Here each column is the cumulative sum, as you go down the rows, of the original column in Flux.
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2020-6-3
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