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

X=X';