# How to fix in Gauss formula

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Anton Anton 2020 年 12 月 15 日
コメント済み: Jon 2020 年 12 月 16 日
Hello,
I have here two formulas of Jacobi and Gauss. I wrote code in the method Jacobi and it worked for me, but in Gauss there is a problem it came out to me a matrix instead of a vector.
I have a problem with B and c in Gauss, If I did right.
Thanks for the helpers
%Jacobi
L = tril(A,-1);
U = triu(A,1);
D = diag(A);
B = -1./D.*(L+U);
c = (1./D).*b;
x_new = B*x+c;
%Gauss
L = tril(A,-1);
U = triu(A,1);
D = diag(A);
B = -1./(L+D).*U;
c = (1./(L+D)).*b;
x_new = B*x+c;

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### 採用された回答

Jon 2020 年 12 月 15 日
It looks like in your calculation of c in both the Jacobi and Gauss you should do a Matrix -vector multiply not an element by element so replace yours with
c = (1./D)*b;
and
c = (1./(L+D))*b;
Maybe there are some other issues too.
Also as a comment you compute the same terms multiple times which isn't too efficient, e.g. 1./(L+D) gets computed twice in your Gauss calculation.
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Jon 2020 年 12 月 16 日

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