By Peter Zornig, Peter Zeornig
This e-book is an advent to nonlinear programming, written for college students from the fields of utilized arithmetic, engineering, and economic climate. It bargains with theoretical foundations in addition assolution tools, starting with the classical tactics and attaining as much as "modern" tools. numerous examples, routines with certain strategies and purposes are supplied, making the textual content enough for person reports.
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Extra info for Nonlinear Programming: An Introduction
Given the problem min −( x1 − 1)2 − (x2 − 1)2 x 1 , x2 ≥ 0 . 10. Consider the four cases: x∗ 1 = 0, x∗ 2 = 0; x∗ 1 = 0, x∗ 2 > 0; x∗ 1 > 0, x∗ 2 = 0; x∗ 1 > 0, x∗ 2 > 0. (b) Which of the points determined in (a) are in fact local minima? 11). Is there a global minimum point? 16 (Second-order necessary optimality conditions). If x∗ is a local mini mum point of f over M, the following conditions are satisfied for any feasible direction d at x∗ : (i) d T grad f (x∗ ) ≥ 0 (ii) d T grad f (x∗ ) = 0 implies d T Hf (x∗ )d ≥ 0.
12 (First-order necessary optimality condition for interior points). If the inner point x∗ of M is a local minimum point of f over M, then grad f (x∗ ) = 0 . Proof. At interior points all directions are feasible. 10 implies that d T grad f (x∗ ) ≥ 0 for all vectors d ∈ Rn . Thus, grad f (x∗ ) = 0. 13. Obviously x∗ = (2, 3)T is a local (and global) minimum point of f ( x1 , x2 ) = 5(x1 − 2)2 + 2( x2 − 3)4 over R2 . The necessary condition for an interior point is satisfied: grad f (x∗ ) = 10(x1 − 2) 8 ( x 2 − 3 )3 = x=x∗ 0 0 .
Ii) Q is positive definite, if and only if all successive principal minors are positive. Q is positive semidefinite, if and only if all principal minors are nonnegative. (iii) Q is positive definite, if and only if all eigenvalues are positive. Q is positive semidefinite, if and only if all eigenvalues are nonnegative. 30. Which of the following matrices is positive (semi)definite? ⎛ (a) 3 2 2 4 (b) 9 6 6 4 (c) 2 −4 −4 3 15 ⎜ (d) ⎝ 3 2 3 1 0 ⎞ 2 ⎟ 0⎠ 1 ⎛ 13 ⎜ (e) ⎝ 2 1 2 −3 0 ⎞ 1 ⎟ 4⎠ . 31. Determine all principal minors of the matrix ⎛ ⎞ 2 3 −1 5 ⎜ ⎟ ⎜3 8 2 1⎟ ⎜ ⎟.