Dimensional Problem with simple coefficient equation

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!

Answer 1

[Prudhvi Peddagoni]

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

[Kevin Zhou]

THANK YOU SO MUCH