 # Inverse Quadratic Interpolation For Finding Roots of Linear and Nonlinear Equations

by admin in on June 14, 2019

inverse quadratic interpolation is a root-finding algorithm, meaning that it is an algorithm for solving equations of the form f(x) = 0. The idea is to use quadratic interpolation to approximate the inverse of f. This algorithm is rarely used on its own, but it is important because it forms part of the popular Brent’s method.

### Example On Using This Code

Input

f = @(x) x.^2-exp(x); % Equation we interested to solve
a = -10;              % First interval [a b] Term a
b = +10;              % Final interval [a b] Term b
err = 0.001;          % Error Tolerance

Output  Root X = -0.70347 , # Iterations = 7 , Accuracy f(X) = -6.4709e-13  ### Contents

• The method
• Explanation of the method
• Behaviour
• Comparison with other root-finding methods
• References

### The Method

The inverse quadratic interpolation algorithm is defined by the recurrence relation  where fk = f(xk). As can be seen from the recurrence relation, this method requires three initial values, x0x1 and x2.

### Explanation of the Method

We use the three preceding iterates, xn−2xn−1 and xn, with their function values, fn−2fn−1 and fn. Applying the Lagrange interpolation formula to do quadratic interpolation on the inverse of f yields  We are looking for a root of f, so we substitute y = f(x) = 0 in the above equation and this results in the above recursion formula.

### Behaviour

The asymptotic behaviour is very good: generally, the iterates xn converge fast to the root once they get close. However, performance is often quite poor if you do not start very close to the actual root. For instance, if by any chance two of the function values fn−2fn−1 and fn coincide, the algorithm fails completely. Thus, inverse quadratic interpolation is seldom used as a stand-alone algorithm. The order of this convergence is approximately 1.8 as can be proved by Secant Method analysis.

### Comparison With Other Root-Finding Methods

As noted in the introduction, inverse quadratic interpolation is used in Brent’s method. Inverse quadratic interpolation is also closely related to some other root-finding methods. Using linear interpolation instead of quadratic interpolation gives the secant method. Interpolating f instead of the inverse of f gives Muller’s method.

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June 14, 2019

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June 14, 2019