genopt.algorithm.util.math

Class Fun

java.lang.Object

genopt.algorithm.util.math.Fun

public class Fun
extends java.lang.Object

Collection of mathematical functions. This package is scanned by FunctionEvaluator.

This project was carried out at:

• Lawrence Berkeley National Laboratory (LBNL), Simulation Research Group,

and supported by

• the U.S. Department of Energy (DOE),
• the Swiss Academy of Engineering Sciences (SATW),
• the Swiss National Energy Fund (NEFF), and
• the Swiss National Science Foundation (SNSF)

GenOpt Copyright (c) 1998-2021, The Regents of the University of California, through Lawrence Berkeley National Laboratory (subject to receipt of any required approvals from the U.S. Dept. of Energy). All rights reserved.

Version:

GenOpt(R) 3.1.1 (March 24, 2016)

Author:

Michael Wetter

Field Summary

Fields

Modifier and Type	Field and Description
private static double	LN10 Natural logarithm of 10.

Constructor Summary

Constructors

Constructor and Description
Fun()

Method Summary

Modifier and Type	Method and Description
static double	add(double x0, double x1) Adds two numbers.
static double	add(double x0, double x1, double x2) Adds three numbers.
static double	add(double x0, double x1, double x2, double x3) Adds four numbers.
static double	add(double x0, double x1, double x2, double x3, double x4) Adds five numbers.
static double	add(double x0, double x1, double x2, double x3, double x4, double x5) Adds six numbers.
static double	divide(double x, double y) Divides two numbers.
static double[]	getSpacing(int nStep, double x0, double x1) Gets an array containing spacing between x0 and x1.
static double	log10(double x0) Returns the logarithm (base 10) of a double value.
static double	multiply(double x0, double x1) Multiplies two numbers.
static double	multiply(double x0, double x1, double x2) Multiplies three numbers.
static double	subtract(double x0, double x1) Subtracts two numbers.

Methods inherited from class java.lang.Object

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

Field Detail

LN10

private static final double LN10

Natural logarithm of 10.

Constructor Detail

Fun

public Fun()

Method Detail

getSpacing

public static final double[] getSpacing(int nStep,
                                        double x0,
                                        double x1)

Gets an array containing spacing between x0 and x1.

Parameters:

nStep - number of intervals. If negative, spacing will be logarithmic, otherwise it will be linear

x0 - first point of spacing

x1 - last point of spacing

Returns:

array with all coordinate values

log10

public static final double log10(double x0)

Returns the logarithm (base 10) of a double value.
Special cases:

• If the argument is NaN or less than zero, then the result is NaN.
• If the argument is positive infinity, then the result is positive infinity.
• If the argument is positive zero or negative zero, then the result is negative infinity.

Parameters:

x0 - - a number greater than 0

Returns:

the logarithm of x.

add

public static final double add(double x0,
                               double x1)

Adds two numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

Returns:

the sum of the arguments

add

public static final double add(double x0,
                               double x1,
                               double x2)

Adds three numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

x2 - 3rd argument

Returns:

the sum of the arguments

add

public static final double add(double x0,
                               double x1,
                               double x2,
                               double x3)

Adds four numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

x2 - 3rd argument

x3 - 4th argument

Returns:

the sum of the arguments

add

public static final double add(double x0,
                               double x1,
                               double x2,
                               double x3,
                               double x4)

Adds five numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

x2 - 3rd argument

x3 - 4th argument

x4 - 5th argument

Returns:

the sum of the arguments

add

public static final double add(double x0,
                               double x1,
                               double x2,
                               double x3,
                               double x4,
                               double x5)

Adds six numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

x2 - 3rd argument

x3 - 4th argument

x4 - 5th argument

x5 - 6th argument

Returns:

the sum of the arguments

subtract

public static final double subtract(double x0,
                                    double x1)

Subtracts two numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

Returns:

the difference x0 - x1

multiply

public static final double multiply(double x0,
                                    double x1)

Multiplies two numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

Returns:

the product of the arguments

multiply

public static final double multiply(double x0,
                                    double x1,
                                    double x2)

Multiplies three numbers. This method is typically being used by FunctionEvaluator

Parameters:

x0 - 1st argument

x1 - 2nd argument

x2 - 3rd argument

Returns:

the product of the arguments

divide

public static final double divide(double x,
                                  double y)

Divides two numbers. This method is typically being used by FunctionEvaluator

Parameters:

x - 1st argument

y - 2nd argument

Returns:

the ratio x/y