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# cumsum but withe the twelfth observation

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Zak le 30 Mai 2013
Clôturé : MATLAB Answer Bot le 20 Août 2021
I am using monthly data in twelfth difference (annuel variation) and for the final results I want to come back the level. I know that for the first différence we can use the cumsum function: cumsum(X(i,:,:),2)
How can I do the same think to cumulate the twelfth difference. Thanks
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Zak le 11 Juin 2013
I wrote this code which works well with matrix, but not in the general case. I mean when the input is an array it doesn't work. "cumsum" function works even when the input is an array
[line col] = size(x); result = zeros(line,col);
for j=13:col; for i=1:line; result(i,1:12) = x(i,1:12); result(i,j) = result(i,j-12) + x(i,j); end; end;

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Julius le 10 Juin 2013
Just do cumsum repeatedly for 12 times.

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