weka.core

Class UtilsPT

java.lang.Object

weka.core.UtilsPT

public class UtilsPT
extends Object

Since:

0.2.0

Version:

0.2.0

Author:

pawel trajdos

Constructor Summary

Constructors

Constructor and Description
UtilsPT()

Method Summary

Modifier and Type	Method and Description
static boolean	compareDoubleArrays(double[] arr1, double[] arr2) Compares two double arrays.
static boolean	compareFloatArrays(float[] arr1, float[] arr2) Compares two float arrays.
static double	corr(double[] arr1, double[] arr2) Calculate correlation of two samples (arrays)
static double	cov(double[] arr1, double[] arr2) Calculate covariance of two samples of equal length (arr1, arr2)
static String	getClassAndOptions(Object obj) Helper function for getting options Return string for object and its options.
static double	median(double[] array)
static double	parseDoubleOption(String[] options, String optionFlag, double defValue) Parses the double option from options.
static int	parseIntegerOption(String[] options, String optionFlag, int defValue) Parses the integer option from options.
static Object	parseObjectOptions(String[] options, String optionFlag, Object defValue, Class<?> classtype) Parses Object from options.
static double	quantile(double[] array, double q) Calculates q-order quantile from the sample
static double[]	softMax(double[] array) Calculates soft-max of the array
static double[]	softMin(double[] array) Calculates soft-min of the array
static double	stdDev(double[] array) Calculates standard deviation of the sample (array)
static double	truncatedMean(double[] array) Calculated the truncated mean for the given array
static double	var(double[] array) Calculate variance of the sample (array)

Methods inherited from class java.lang.Object

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

Constructor Detail

UtilsPT

public UtilsPT()

Method Detail

median

public static double median(double[] array)

Parameters:

array - -- array of real numbers

Returns:

-- median of the sample

quantile

public static double quantile(double[] array,
                              double q)

Calculates q-order quantile from the sample

Parameters:

array - -- sample

q - -- quantile order [0,1]

Returns:

quantile

Since:

0.12.0

truncatedMean

public static double truncatedMean(double[] array)

Calculated the truncated mean for the given array

Parameters:

array - -- array to calculate the truncated means

Returns:

truncated mean

Since:

0.3.0

var

public static double var(double[] array)

Calculate variance of the sample (array)

Parameters:

array -

Returns:

Since:

0.4.0

stdDev

public static double stdDev(double[] array)

Calculates standard deviation of the sample (array)

Parameters:

array -

Returns:

Since:

0.4.0

cov

public static double cov(double[] arr1,
                         double[] arr2)
                  throws Exception

Calculate covariance of two samples of equal length (arr1, arr2)

Parameters:

arr1 -

arr2 -

Returns:

Throws:

Exception - when samples are incompatible

Since:

0.4.0

corr

public static double corr(double[] arr1,
                          double[] arr2)
                   throws Exception

Calculate correlation of two samples (arrays)

Parameters:

arr1 -

arr2 -

Returns:

Throws:

Exception - when arrays are incompatible

Since:

0.4.0

compareDoubleArrays

public static boolean compareDoubleArrays(double[] arr1,
                                          double[] arr2)

Compares two double arrays.

Parameters:

arr1 -

arr2 -

Returns:

Since:

0.5.0

compareFloatArrays

public static boolean compareFloatArrays(float[] arr1,
                                         float[] arr2)

Compares two float arrays.

Parameters:

arr1 -

arr2 -

Returns:

Since:

0.5.0

getClassAndOptions

public static String getClassAndOptions(Object obj)

Helper function for getting options Return string for object and its options.

Parameters:

obj -

Returns:

Since:

0.6.0

parseIntegerOption

public static int parseIntegerOption(String[] options,
                                     String optionFlag,
                                     int defValue)

Parses the integer option from options. If the integer option is invalid returns defaultValue

Parameters:

options -

optionFlag - -- flag of the option

defValue - -- default Value

Returns:

Since:

0.6.0

parseDoubleOption

public static double parseDoubleOption(String[] options,
                                       String optionFlag,
                                       double defValue)

Parses the double option from options. If the integer option is invalid returns defaultValue

Parameters:

options -

optionFlag - -- flag of the option

defValue - -- default Value

Returns:

Since:

0.6.0

parseObjectOptions

public static Object parseObjectOptions(String[] options,
                                        String optionFlag,
                                        Object defValue,
                                        Class<?> classtype)
                                 throws Exception

Parses Object from options. If the object cannot be parsed, then the default value is used.

Parameters:

options -

optionFlag -

defValue -

classtype -

Returns:

Throws:

Exception

Since:

0.6.0

softMax

public static double[] softMax(double[] array)

Calculates soft-max of the array

Parameters:

array -

Returns:

Since:

0.7.0

softMin

public static double[] softMin(double[] array)

Calculates soft-min of the array

Parameters:

array -

Returns:

Since:

0.7.0