Question: Hello, I need fix my code A = [ 2 - 1 0 ; - 1 2 - 1 ; 0 - 1 2 ]

Hello, I need fix my code
A=[2-10;-12-1; 0-12];
b=[3-31]'
[L,D,P]= ldl(A);
% solve L1 D1 P1 x = b
y=L1\b;
z=D1\y;
xa=P1\z;
x=A\b % exact solution
Q: Why does the solution xa not match the solution x !

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