MATLAB: Sum up parts of a vector

cumsumsumvector

Dear all,

I have a 105120*1 vector and I want to sum up in steps of 288. So I want to have the sum of the first 288 elements, then the sum of the next 288 elements and so, until the end of the vector. So finally I want to have a new vector of the dimension 365*1. So I need finally 365 sums. How can I do that?

Best Answer

x=rand(105120,1);
out=sum(reshape(x,288,[]))'

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If Gsum is sparse, there may be better ways than the following fft-based method:

numBlocks=10;
M=14;
N=length(Gsum);
K=1200;
   f=@(t) mod(t-1,N)+1;
   shifts = f(1:numBlocks*M:numBlocks*M*(K-1)+1);
   comb=accumarray(shifts.',1,[N,1]).';
   Havg=ifft(fft(Gsum).*fft(comb),'symmetric');

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Try

vekt = xlsread(............

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