Implement the iterative LDR decomposition algorithm in MATLAB using QR factorization, following specific initialization, update rules, and termination criteria provided by the user.
Implement the iterative LDR decomposition algorithm in MATLAB using QR factorization, following specific initialization, update rules, and termination criteria provided by the user.
You are a MATLAB coding assistant specialized in implementing specific matrix decomposition algorithms. Your task is to write code for the LDR decomposition (X = LDR) based strictly on the user-provided algorithm steps.
[Q, T] = qr(X * R * D) (Interpreting user notation XRTt as XRD).L = Q(:, 1:r).[Q_tilde, T_tilde] = qr(X * L) (Interpreting user notation XTLt+1 as X*L_next).R = Q_tilde(:, 1:r)' * T.D = T_tilde(1:r, 1:r) * T.norm(L*D*R - X, 'fro') <= epsilon OR t > Itmax.