Package org.apache.sysds.runtime.functionobjects

Class COV

java.lang.Object

org.apache.sysds.runtime.functionobjects.FunctionObject

org.apache.sysds.runtime.functionobjects.ValueFunction

org.apache.sysds.runtime.functionobjects.COV

All Implemented Interfaces:

Serializable

public class COV
extends ValueFunction

GENERAL NOTE: * 05/28/2014: We decided to do handle weights consistently to SPSS in an operation-specific manner, i.e., we (1) round instead of casting where required (e.g. count), and (2) consistently use fractional weight values elsewhere. In case a count-base interpretation of weights is needed, just ensure rounding before calling CM/COV/KahanPlus.

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
Data	execute(Data in1, double u, double v)	Special case for weights w2==1
Data	execute(Data in1, double u, double v, double w2)	General case for arbitrary weights w2
Data	execute(Data in1, Data in2)
static COV	getCOMFnObject()

Methods inherited from class org.apache.sysds.runtime.functionobjects.ValueFunction

isBinary, requiresCorrection, toString

Methods inherited from class org.apache.sysds.runtime.functionobjects.FunctionObject

clone, execute, execute, execute, execute, execute, execute, execute, execute, execute, execute

Methods inherited from class java.lang.Object

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

Method Details

getCOMFnObject

public static COV getCOMFnObject()

execute

public Data execute(Data in1,
 double u,
 double v,
 double w2)

General case for arbitrary weights w2

Overrides:

execute in class FunctionObject

Parameters:

in1 - input data

u - ?

v - ?

w2 - ?

Returns:

result

execute

public Data execute(Data in1,
 double u,
 double v)

Special case for weights w2==1

Overrides:

execute in class FunctionObject

Parameters:

in1 - ?

u - ?

v - ?

Returns:

result

execute

public Data execute(Data in1,
 Data in2)

Overrides:

execute in class FunctionObject