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Root of nonlinear function

`x = fzero(fun,x0)`

`x = fzero(fun,x0,options)`

`x = fzero(problem)`

```
[x,fval,exitflag,output]
= fzero(___)
```

The `fzero`

command
is a function file. The algorithm, created by T. Dekker,
uses a combination of bisection, secant, and inverse quadratic interpolation
methods. An Algol 60 version, with some improvements, is given in [1]. A Fortran version, upon which `fzero`

is
based, is in [2].

[1] Brent, R., Algorithms for Minimization Without Derivatives, Prentice-Hall, 1973.

[2] Forsythe, G. E., M. A. Malcolm, and C. B. Moler, Computer Methods for Mathematical Computations, Prentice-Hall, 1976.

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