com.joptimizer.util

Class Utils

java.lang.Object

com.joptimizer.util.Utils

public class Utils
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and Description
static double	calculateDeterminant(double[][] ai, int dim) Brute-force determinant calculation.
static double[][]	createConstantDiagonalMatrix(int dim, double c)
static double	getDoubleMachineEpsilon() The smallest positive (epsilon) such that 1.0 + epsilon != 1.0.
static int	getMaxIndex(double[] v) Get the index of the maximum entry.
static int	getMinIndex(double[] v) Get the index of the minimum entry.
static double[][]	lowerTriangularMatrixUnverse(double[][] L)
static DoubleMatrix2D	randomValuesMatrix(int rows, int cols, double min, double max)
static DoubleMatrix2D	randomValuesMatrix(int rows, int cols, double min, double max, java.lang.Long seed)
static DoubleMatrix2D	randomValuesPositiveMatrix(int rows, int cols, double min, double max, java.lang.Long seed)
static RealMatrix	squareMatrixInverse(RealMatrix M)
static double[][]	upperTriangularMatrixUnverse(double[][] L)

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

randomValuesMatrix

public static DoubleMatrix2D randomValuesMatrix(int rows,
                                                int cols,
                                                double min,
                                                double max)

randomValuesMatrix

public static DoubleMatrix2D randomValuesMatrix(int rows,
                                                int cols,
                                                double min,
                                                double max,
                                                java.lang.Long seed)

randomValuesPositiveMatrix

public static DoubleMatrix2D randomValuesPositiveMatrix(int rows,
                                                        int cols,
                                                        double min,
                                                        double max,
                                                        java.lang.Long seed)

See Also:

"http://mathworld.wolfram.com/PositiveDefiniteMatrix.html"

getDoubleMachineEpsilon

public static final double getDoubleMachineEpsilon()

The smallest positive (epsilon) such that 1.0 + epsilon != 1.0.

See Also:

http://en.wikipedia.org/wiki/Machine_epsilon#Approximation_using_Java

squareMatrixInverse

public static RealMatrix squareMatrixInverse(RealMatrix M)
                                      throws SingularMatrixException

Throws:

SingularMatrixException

See Also:

http://en.wikipedia.org/wiki/Machine_epsilon#Approximation_using_Java

getMaxIndex

public static int getMaxIndex(double[] v)

Get the index of the maximum entry.

getMinIndex

public static int getMinIndex(double[] v)

Get the index of the minimum entry.

createConstantDiagonalMatrix

public static final double[][] createConstantDiagonalMatrix(int dim,
                                                            double c)

upperTriangularMatrixUnverse

public static final double[][] upperTriangularMatrixUnverse(double[][] L)
                                                     throws java.lang.Exception

Throws:

java.lang.Exception

lowerTriangularMatrixUnverse

public static final double[][] lowerTriangularMatrixUnverse(double[][] L)
                                                     throws java.lang.Exception

Throws:

java.lang.Exception

calculateDeterminant

public static final double calculateDeterminant(double[][] ai,
                                                int dim)

Brute-force determinant calculation.