# Read e-book online Beginning PHP 5.3 PDF

By Matt Doyle

ISBN-10: 0470413964

ISBN-13: 9780470413968

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**Additional resources for Beginning PHP 5.3**

**Example text**

1). 1) requires order n3 operations when /'(x) is dense. Convergence of Newton's method is guaranteed if XQ is sufficiently close to the solution x* and /'(x*) is nonsingular. Under these conditions the rate of convergence is quadratic; that is. 21 22 OPTIMIZATION SOFTWARE GUIDE for some positive constant (3. This rapid local convergence is the main advantage of Newton's method. The disadvantages include the need to calculate the Jacobian matrix and the lack of guaranteed global convergence; that is, convergence from remote starting points.

In this approach, (x*, A*) is calculated from the formulae Although this approach works only for a subclass of problems, there are many applications in which it is useful. 1) solve a sequence of equality-constrained problems. Given a feasible £&, these methods find a direction dk by solving the subproblem where q is the objective function QUADRATIC PROGRAMMING 37 and Wfc is a working set of constraints. In all cases Wfc is a subset of the set of constraints that are active at xk. Typically, Wfc either is equal to A(xk) or else has one fewer index than A(xk)> The working set Wfc is updated at each iteration with the aim of determining the set A* of active constraints at a solution x*.

The code contains heuristics for adjusting the value of rk between iterations. As the solution x* is approached, rk is decreased to zero to ensure superlinear convergence. When derivatives are not available or are difficult to calculate, the matrix Bk can be either a finite-difference approximation to the Jacobian matrix or a matrix generated by Broyden's method. { is the ith unit vector (the ith component of ej is 1; all other components are zero). The choice of the difference parameter hi can be a source of difficulty for many codes, particularly if the problem is highly nonlinear or if the function is noisy.

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