weka.core
Class MathematicalExpression.TreeNode

java.lang.Object
  weka.core.MathematicalExpression.TreeNode

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

MathematicalExpression

public static class MathematicalExpression.TreeNode
extends java.lang.Object
implements java.io.Serializable

Tree Node of MathematicalExpression

Version:

$Revision: 1.3 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz), Prados Julien (julien.prados@cui.unige.ch)

See Also:

Serialized Form

Field Summary

static int[]	arity The arity of the known functions
static java.lang.String[]	funs The known functions

Constructor Summary

MathematicalExpression.TreeNode(double v)
Construct a constant node

MathematicalExpression.TreeNode(int t, java.util.Vector ops)
Construct an operator node

MathematicalExpression.TreeNode(MathematicalExpression.TreeNode n)
Construct a constant node

MathematicalExpression.TreeNode(java.lang.String v)
Construct a variable node

MathematicalExpression.TreeNode(java.lang.String f, java.util.Vector ops)
Construct a function node

MathematicalExpression.TreeNode(java.util.Vector p)
Construct an ifelse node

Method Summary

double

eval(java.util.Map symbols) Evaluate the tree with for specific values of the variables

Methods inherited from class java.lang.Object

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

Field Detail

funs

public static java.lang.String[] funs

The known functions

arity

public static int[] arity

The arity of the known functions

Constructor Detail

MathematicalExpression.TreeNode

public MathematicalExpression.TreeNode(double v)

Construct a constant node

Parameters:

v - the value of the constant

MathematicalExpression.TreeNode

public MathematicalExpression.TreeNode(MathematicalExpression.TreeNode n)

Construct a constant node

Parameters:

n - the value of the constant

MathematicalExpression.TreeNode

public MathematicalExpression.TreeNode(java.lang.String v)

Construct a variable node

Parameters:

v - the name of the variable

MathematicalExpression.TreeNode

public MathematicalExpression.TreeNode(java.util.Vector p)

Construct an ifelse node

Parameters:

p - parameters of the ifelse

MathematicalExpression.TreeNode

public MathematicalExpression.TreeNode(java.lang.String f,
                                       java.util.Vector ops)
                                throws java.lang.Exception

Construct a function node

Parameters:

f - the name of the function

ops - the operands of the function

Throws:

java.lang.Exception - if function is unknown or wrong arity

MathematicalExpression.TreeNode

public MathematicalExpression.TreeNode(int t,
                                       java.util.Vector ops)
                                throws java.lang.Exception

Construct an operator node

Parameters:

t - the operator '+','-','*','/'

ops - the operands of the operator

Throws:

java.lang.Exception - is something goes wrong

Method Detail

eval

public double eval(java.util.Map symbols)
            throws java.lang.Exception

Evaluate the tree with for specific values of the variables

Parameters:

symbols - a map associating a Double value to each variable name

Returns:

the evaluation

Throws:

java.lang.Exception - if a symbol, function or node type is unknown