Jacobi method giving an error

For a numerical methods class I am in I have to create a function that solve an arbitrarily system of linear equations using the jacobi method. I am testing out a code from my textbook

    %
function X=jacobi(A,B,P,delta,max1)
N = length(B);

if true
  % code
end
for k=1:max1
 for j=1:N
    X(j)=(B(j)-A(j,[1:j-1,j+1:N])*P([1:j-1,j+1:N]))/A(j,j);
 end
 err=abs(norm(X'-P));
 relerr=err/(norm(X)+eps);
 P=X';
    if (err<delta)||(relerr<delta)
   break
 end
end

if true
  % code
end
X=X';

end

end

Where delta is my tolerance and max1 is number of iterations.

And when I enter it (after defining my A,B, and P terms) I am giving the following error:

if true
  % code
X=@jacobi(A,b,P,0.001,1);
X=@jacobi(A,b,P,0.001,1);
        ↑
Error: Unbalanced or unexpected parenthesis or bracket.
end

What does this mean? Dont I need to put the function in parenthesis in order for it to run?

Answer 1

[Image Analyst]

Get rid of the @ symbol. Just call it by it's name alone.

X = jacobi(A,b,P,0.001,1);

[Isaac Al-rai]

Than you, I appreciate it

[Isaac Al-rai]

Thought I might ask this too, is there a way I can make this function run using only one for loop?

[Image Analyst]

Looks like you might be able to do it with conv() or conv2(), but I've not gotten into the details to figure it out. Maybe you can.