convert from Matlab to equation (formula)

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Hello, I hope you are doing well
Just a simple question, I have this short code which includes a loop:
syms Y3 GOD
for j=1:numel(Y3)
if j==1
GOD(j)=Y3(j);
else
GOD(j)=Y3(j)-sum(GOD);
end
end
I am very intuitive with matlab, and I am not so good in algebra, how can I write these lines of code as formula?
I know there are several ways to convert a formula to matlab code but not the other way around....
any suggestion is higly appreciated
Best
  2 Comments
Jules Ray
Jules Ray on 3 Aug 2021
thank for your question, GOD is the output, Y3 is just a vector of 5 elements e.g. Y3=[1 2 3 4 5];
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Accepted Answer

Walter Roberson
Walter Roberson on 2 Aug 2021
syms Y3 [1 5]
syms GOD [1 5]
for j=1:numel(Y3)
if j==1
GOD(j)=Y3(j);
else
GOD(j)=Y3(j)-sum(GOD(1:j-1));
end
end
GOD.'
ans = 
GOD2 = [Y3(1), Y3(2:end)-Y3(1:end-1)];
GOD2.'
ans = 
So you can replace the loop with the formula I show in GOD2

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R2017b

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