NewtonRootFinder

java.lang.Object
- net.sf.tweety.math.opt.rootFinder.RootFinder
- - net.sf.tweety.math.opt.rootFinder.NewtonRootFinder

```
public class NewtonRootFinder
extends RootFinder
```
This class implements the Newton method for finding zeros of a function.

Author:

Matthias Thimm

Field Summary

Fields
Modifier and Type Field Description

static int MAX_FIX_ITERATIONS
The maximum number of fixing iterations.

static double PRECISION
The precision of the approximation.

Constructor Summary

Constructors
Constructor Description

NewtonRootFinder()
Creates a new Newton root finder for the given starting point and the given function

Method Summary

Modifier and Type	Method	Description
`java.util.Map<Variable,Term>`	`randomRoot(java.util.List<Term> functions, java.util.Map<Variable,Term> startingPoint)`	Determines the values for the variables appearing in the function such the function evaluates to zero.

Methods inherited from class net.sf.tweety.math.opt.rootFinder.RootFinder
getFunctions, getStartingPoint, setStartingPoint

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PRECISION
```
public static final double PRECISION
```
    The precision of the approximation. The actual used precision depends on the number of variables.
    
    See Also:
    
    Constant Field Values
  - MAX_FIX_ITERATIONS
```
public static final int MAX_FIX_ITERATIONS
```
    The maximum number of fixing iterations.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - NewtonRootFinder
```
public NewtonRootFinder()
```
    Creates a new Newton root finder for the given starting point and the given function
- Method Detail
  - randomRoot
```
public java.util.Map<Variable,Term> randomRoot(java.util.List<Term> functions,
                                                     java.util.Map<Variable,Term> startingPoint)
                                              throws GeneralMathException
```
    Description copied from class: RootFinder
    
    Determines the values for the variables appearing in the function such the function evaluates to zero.
    
    Specified by:
    
    randomRoot in class RootFinder
    
    Parameters:
    
    functions - the functions
    
    startingPoint - the starting point for the search
    
    Returns:
    
    a map from variables to terms such that "function" evaluates to zero.
    
    Throws:
    
    GeneralMathException - if something went wrong.