Evaluatable1D

All Known Implementing Classes:

AbstractEvaluatable1D
```
public interface Evaluatable1D
```
An interface that defines a 1D function y = fn(x) (named "function") that can be called by math tools such as root finders. Also defines the derivative of the function. dy/dx = d fn(x)/dx (oddly enough, named "derivative").
Modified by: Joseph A. Huwaldt

Version:

February 23, 2025

Author:

Joseph A. Huwaldt Date: October 7, 1998

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`double`	`derivative(double x)`	Calculates the derivative of the function `dy/dx = d fn(x)/dx`.
`double`	`function(double x)`	User supplied method that calculates the function y = fn(x).

- Method Detail
  - function
```
double function(double x)
         throws RootException
```
    User supplied method that calculates the function y = fn(x). Classes implementing this interface must define this function.
    
    Parameters:
    
    x - Independent parameter to the function.
    
    Returns:
    
    The function value at x.
    
    Throws:
    
    RootException - if there is a problem computing the function.
  - derivative
```
double derivative(double x)
           throws RootException
```
    Calculates the derivative of the function dy/dx = d fn(x)/dx. Classes wanting to return the derivative of the function at x should override this function. If the method using this class doesn't require the derivative, do nothing and Double.NaN is returned.
    
    Parameters:
    
    x - Independent parameter to the function.
    
    Returns:
    
    The function value at x or Double.NaN if the derivative is not defined.
    
    Throws:
    
    RootException - if there is a problem computing the derivative.