com.itemanalysis.psychometrics.uncmin

Class Fmin

java.lang.Object

com.itemanalysis.psychometrics.uncmin.Fmin

public class Fmin
extends java.lang.Object

This class was translated by a statistician from the FORTRAN version of fmin. It is NOT an official translation. When public domain Java optimization routines become available from professional numerical analysts, then THE CODE PRODUCED BY THE NUMERICAL ANALYSTS SHOULD BE USED.

Meanwhile, if you have suggestions for improving this code, please contact Steve Verrill at steve@www1.fpl.fs.fed.us.

Author:

Steve Verrill

Constructor Summary

Constructors

Constructor and Description
Fmin()

Method Summary

Modifier and Type	Method and Description
static double	fmin(double a, double b, Fmin_methods minclass, double tol) This method performs a 1-dimensional minimization.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Fmin

public Fmin()

Method Detail

fmin

public static double fmin(double a,
                          double b,
                          Fmin_methods minclass,
                          double tol)

This method performs a 1-dimensional minimization. It implements Brent's method which combines a golden-section search and parabolic interpolation. The introductory comments from the FORTRAN version are provided below. This method is a translation from FORTRAN to Java of the Netlib function fmin. In the Netlib listing no author is given. Translated by Steve Verrill, March 24, 1998.

Parameters:

a - Left endpoint of initial interval

b - Right endpoint of initial interval

minclass - A class that defines a method, f_to_minimize, to minimize. The class must implement the Fmin_methods interface (see the definition in Fmin_methods.java). See FminTest.java for an example of such a class. f_to_minimize must have one double valued argument.

tol - Desired length of the interval in which the minimum will be determined to lie (This should be greater than, roughly, 3.0e-8.)