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# Dimensional Problem with simple coefficient equation

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Kevin Zhou on 22 Dec 2020
Commented: Kevin Zhou on 3 Jan 2021 I am trying to create this function in MATLAB. From a previous question, I have solved for a as "agrid2" and f(a) as "fx", whose dimensions are 600 by 1 and 600 by 2- these two vectors are absolutely correct:
%calculating gini coefficent
m=600;
for i=1:m %expanded length of kgrid of ai previously calculated in invarden.m
mu= sum(agrid2.*fx(m,:));
gini= sum(fx(m,1)*(fx(m,2))*abs(fx(m,1)-fx(m,2)))./(2*mu);
end
However, my code is returning all blank answers- what did I do wrong? Any advice is greatly appreciated!
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### Accepted Answer

Prudhvi Peddagoni on 30 Dec 2020
Hi,
For two summations, you will need two for loops. Also , you are not accumulating the sum. Variable gini is getting new value for every iteration. So you are losing the data from previous iterations.
For an equation like G= , the code will be like this:
sum=0;
for i = 1:40
for j = 50
sum = sum + (i+j);
end
end
G = sum;
Hope this helps
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Kevin Zhou on 3 Jan 2021
THANK YOU SO MUCH

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