# Double Summation For two point correlation

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Nicole Konforti il 3 Mar 2017
I have to use the double summation function (attached below) where the phi function is the distance formula in three dimensional space. I have the function I need, but I am not sure how to program it into a double summation on MATLAB.
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Alexandra Harkai il 3 Mar 2017
What have you tried so far? What are D and R? What arguments does your phi function take?

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### Risposte (1)

Darshan Ramakant Bhat il 6 Mar 2017
I think the simpler way is to do using two for loops.
d_sum=0;
for i=1:length(D)
x=D(i);
for j=1:length(R)
y=R(j);
d_sum=d_sum+fi_fun(x,y);
end
end
Regards,
Darshan Bhat
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