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hw2p2sol - We see a 7 error in the factorization many...

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% % Homework 2 Problem 2 % A=-.99999*tril(ones(60,60),-1)+eye(60); A(:,60)=ones(60,1); [L,U]=lu(A); xtrue=randn(60,1); b=A*xtrue; x=U\(L\b); Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.735235e-18. norm(L*U-A)/norm(A) ans = 0.0698
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Unformatted text preview: % We see a 7% error in the factorization - many orders of magnitude % larger than in Problem 1. This indicates an instability in the % factorization. norm(x-xtrue)/norm(xtrue) ans = 0.1513 % Similarly we have a 15% error in the solution....
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