This means bn goes to zero much faster than an.

The software, mathematica 9. It was observed that the Bisection method converges at the 52 second iteration while Newton and Secant methods converge to the exact root of 0. It was then concluded that of the three methods considered, Secant method is the most effective scheme.

This is in line with the result in our Ref.

The root finding problem is one of the most relevant computational problems. It arises in a wide variety of practical applications in Physics, Chemistry, Biosciences, Engineering, etc. As a matter of fact, the determination of any unknown appearing implicitly in scientific or engineering formulas, gives rise to root finding problem [1].

Relevant situations in Physics where such problems are needed to be solved include finding the equilibrium position of an object, potential surface of a field and quantized energy level of confined structure [2].

The common root-finding methods include: Bisection, Newton-Raphson, False position, Secant methods etc. Different methods converge to the root at different rates.

That is, some methods are faster in converging to the root than others. The rate of convergence could be linear, quadratic or otherwise.

The higher the order, the faster the method converges [3]. The study is at comparing the rate of performance convergence of Bisection, Newton-Raphson and Secant as methods of root-finding. Obviously, Newton-Raphson method may converge faster than any other method but when we compare performance, it is needful to consider both cost and speed of convergence.

An algorithm that converges quickly but takes a few seconds per iteration may take more time overall than an algorithm that converges more slowly, but takes only a few milliseconds per iteration [4]. It is often difficult to estimate the cost of evaluating the derivative in general if it is possible [1, ].

It seem safe, to assume that in most cases, evaluating the derivative is at least as costly as evaluating the function [4]. Thus, we can estimate that the Newton iteration takes about two functions evaluation per iteration. This disparity in cost means that we can run two iterations of the secant method in the same time it will take to run one iteration of Newton method.

They observed that the rate of convergence is in the following order: They concluded that Newton method is 7. The root always converges, though very slow in converging [5].

Algorithm of Bisection Method for Root- Finding: If any of the following criteria is satisfied: Let the interval length after N iteration be N.This is considered slow convergence.

In contrast, Newton’s method has a ‘quadratic’ rate of convergence, that is, the number of correct number of decimal places doubles at.

Lecture 7: Root finding I 3/12 3 Bisection If q=1, as it is for bisection, we say the convergence is linear, and we call α the rate of convergence. For q>1 the convergence is said to be superlinear, and specifically, if q=2 the convergence is quadratic.

For superlinear. Bisection Technique The Bisection Method approximates the root of an equation on an interval by repeatedly halving the interval. The Bisection Method operates under the conditions necessary for the Intermediate Value Theorem to hold. Suppose f 2C[a;b] and . Rate of Convergence for the Bracket Methods •The rate of convergence of –False position, p= 1, linear convergence –Netwon ’s method, p= 2, quadratic convergence –Secant method, p= –Fixed point iteration, p= 1, linear convergence •The rate value of rate of convergence is just a theoretical index of convergence in general.

Thus bisection provides linear convergence with a rate of convergence of 1/2. Because of its general applicability and guaranteed convergence, bisection has much to recommend it.

Verifying Numerical Convergence Rates 1 Order of accuracy We consider a numerical approximation of an exact value u. The approximation depends on a small parameter h, such as the grid size or time step, and we denote it by u.

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Numerical Methods Lecture Notes: roots