How to loop around cumsum ?

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 :)

[James Tursa]

Please show a small example. E.g., show a specific 5x3 input and the desired output.

Answer 1

[Image Analyst]

Did you just want the sum of each column? Like this:

columnSums = sum(Flux, 1);

[Lea Enguehard]

I want the cumulative sum of each 3600 value

[Image Analyst]

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.