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optimization and operations research: proceedings of a conference held at oberwolfach, july 27 - august 2, 1975 (en Alemán)
W. Oettli
(Ilustrado por)
·
K. Ritter
(Ilustrado por)
·
Springer
· Tapa Blanda
optimization and operations research: proceedings of a conference held at oberwolfach, july 27 - august 2, 1975 (en Alemán) - Oettli, W. ; Ritter, K.
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Reseña del libro "optimization and operations research: proceedings of a conference held at oberwolfach, july 27 - august 2, 1975 (en Alemán)"
The variable metric algorithm is widely recognised as one of the most efficient ways of solving the following problem: - Locate x* a local minimum point n ( 1) of f(x) x E R Considerable attention has been given to the study of the convergence prop- ties of this algorithm especially for the case where analytic expressions are avai- ble for the derivatives g. = af/ax. i 1 --- n - (2) In particular we shall mention the results of Wolfe (1969) and Powell (1972), (1975). Wolfe established general conditions under which a descent algorithm will converge to a stationary point and Powell showed that two particular very efficient algorithms that cannot be shown to satisfy , olfe's conditions do in fact converge to the minimum of convex functions under certain conditions. These results will be st- ed more completely in Section 2. In most practical problems analytic expressions for the gradient vector g (Equ. 2) are not available and numerical derivatives are subject to truncation error. In Section 3 we shall consider the effects of these errors on Wolfe's convergent prop- ties and will discuss possible modifications of the algorithms to make them reliable in these circumstances. The effects of rounding error are considered in Section 4, whilst in Section 5 these thoughts are extended to include the case of on-line fu- tion minimisation where each function evaluation is subject to random noise.
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