Documentation API of the 'jhplot.math.num.root.BrentRootFinder' Java class

Class BrentRootFinder

  • public class BrentRootFinderextends IterativeMethod

    Brent's method (1) for finding roots of functions.

    For example, to find roots for sine, first a Function is defined:

     Function sine = new Function() {    public double evaluate(double x) {        return Math.sin(x);    }} }; 

    Then, a Brent's method root finder is created with the above function:

     BrentRootFinder finder = new BrentRootFinder(sine); 

    Lastly, locating roots is accomplished using the findRoot(double, double) method:

     // find the root between 3 and 4. double pi = finder.findRoot(3.0, 4.0);  // find the root between -1 and 1. double zero = finder.findRoot(-1.0, 1.0); 


    1. Wikipedia contributors, "Brent's method," Wikipedia, The Free Encyclopedia,

    • Constructor Detail

      • BrentRootFinder

        public BrentRootFinder(Function f)
        Create a root finder for the given function.
        f - the target function.
      • BrentRootFinder

        public BrentRootFinder(Function f,                       int iterations,                       double error)
        Create a root finder for the given function.
        f - the target function.
        iterations - maximum number of iterations.
        error - maximum relative error.
    • Method Detail

      • findRoot

        public double findRoot(double min,                       double max)                throws NumericException
        Find a root of the target function that lies between the two initial approximations, x0 and x1.
        min - the lower bound of the search interval.
        max - the upper bound of the search interval.
        a root that lies between min and max, inclusive.
        NumericException - if a root could not be found.
      • getFunction

        public Function getFunction()
        Access the target function.
        the target function.
      • setFunction

        public void setFunction(Function f)
        Modify the target function.
        f - the new target function.

DMelt 1.2 © DataMelt by jWork.ORG

Warning: You see this message because an access to the DatMelt documentation for third-party Java classes is denied. Guests can only view jhplot Java API. To enable the description of all Java classes of dataMelt, please request the full DataMelt membership.

If you are already a full member, please login to the DataMelt member area before visiting this documentation.