weka.core.pmml

Class BuiltInMath

java.lang.Object

weka.core.pmml.Function

weka.core.pmml.BuiltInMath

All Implemented Interfaces:

Serializable

public class BuiltInMath
extends Function

Built-in function for min, max, sum, avg, log10, ln, sqrt, abs, exp, pow, threshold, floor, ceil and round.

Version:

$Revision 1.0 $

Author:

Mark Hall (mhall{[at]}pentaho{[dot]}com)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BuiltInMath(weka.core.pmml.BuiltInMath.MathFunc func) Construct a new built-in pmml Math function.

Method Summary

Modifier and Type	Method and Description
Attribute	getOutputDef() Get the structure of the result produced by this function.
String[]	getParameterNames() Returns an array of the names of the parameters expected as input by this function.
double	getResult(double[] incoming) Get the result of applying this function.
void	setParameterDefs(ArrayList<Attribute> paramDefs) Set the structure of the parameters that are expected as input by this function.
String	toString()

Methods inherited from class weka.core.pmml.Function

getFunction, getFunction, getName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

BuiltInMath

public BuiltInMath(weka.core.pmml.BuiltInMath.MathFunc func)

Construct a new built-in pmml Math function.

Parameters:

func - the math function to use

Method Detail

setParameterDefs

public void setParameterDefs(ArrayList<Attribute> paramDefs)
                      throws Exception

Set the structure of the parameters that are expected as input by this function. This must be called before getOutputDef() is called.

Specified by:

setParameterDefs in class Function

Parameters:

paramDefs - the structure of the input parameters

Throws:

Exception - if the number or types of parameters are not acceptable by this function

getOutputDef

public Attribute getOutputDef()

Get the structure of the result produced by this function. Subclasses must implement.

Specified by:

getOutputDef in class Function

Returns:

the structure of the result produced by this function.

getParameterNames

public String[] getParameterNames()

Returns an array of the names of the parameters expected as input by this function. May return null if the function can accept an unbounded number of arguments.

Specified by:

getParameterNames in class Function

Returns:

an array of the parameter names (or null if the function can accept any number of arguments).

getResult

public double getResult(double[] incoming)
                 throws Exception

Get the result of applying this function.

Specified by:

getResult in class Function

Parameters:

incoming - the arguments to this function (supplied in order to match that of the parameter definitions

Returns:

the result of applying this function. When the optype is categorical or ordinal, an index into the values of the output definition is returned.

Throws:

Exception - if there is a problem computing the result of this function

toString

public String toString()

Overrides:

toString in class Function