In this set of slides, the finite horizon LQR problem is stated as a least-squares problem (slide 11), and using a naive method (e.g., QR factorization), the cost to solve this problem is $O(N^3nm^2)$ (slide 12). However, it is also said that a less naive method would cost $O(Nn^3)$ (slide 13). What would be a less naive method ?
2026-03-25 15:59:14.1774454354
Linear quadratic regulator via least squares
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