org.matheclipse.parser.client.eval

Class DoubleEvaluator

java.lang.Object

org.matheclipse.parser.client.eval.DoubleEvaluator

Direct Known Subclasses:

EvalDouble

public class DoubleEvaluator
extends java.lang.Object

Evaluate math expressions to double numbers.

Field Summary

Fields

Modifier and Type	Field and Description
static double	EPSILON

Constructor Summary

Constructors

Constructor and Description
DoubleEvaluator()
DoubleEvaluator(ASTNode node, boolean relaxedSyntax)
DoubleEvaluator(boolean relaxedSyntax)

Method Summary

Modifier and Type	Method and Description
void	clearVariables() Clear all defined variables for this evaluator.
void	defineVariable(java.lang.String variableName) Define a value for a given variable name.
void	defineVariable(java.lang.String variableName, BooleanVariable value) Define a boolean value for a given variable name.
void	defineVariable(java.lang.String variableName, double value) Define a value for a given variable name.
void	defineVariable(java.lang.String variableName, IDoubleValue value) Define a value for a given variable name.
ASTNode	derivative(ASTNode node, java.lang.String var)
ASTNode	derivative(ASTNode node, SymbolNode var) TODO: add more derivation rules
double	evaluate() Reevaluate the expression (possibly after a new Variable assignment)
double	evaluate(java.lang.String expression) Parse the given expression String and evaluate it to a double value
double	evaluateFunction(FunctionNode functionNode) Evaluate an already parsed in FunctionNode into a souble number value.
boolean	evaluateFunctionLogical(FunctionNode functionNode)
double	evaluateNode(ASTNode node) Evaluate an already parsed in abstract syntax tree node into a double number value.
boolean	evaluateNodeLogical(ASTNode node)
IDoubleCallbackFunction	getCallbackFunction() A callback function for unknown function names.
IDoubleValue	getVariable(java.lang.String variableName) Returns the double variable value to which the specified variableName is mapped, or null if this map contains no mapping for the variableName.
static void	getVariables(ASTNode node, java.util.Set<java.lang.String> result) Get the variable names from the given AST node.
void	getVariables(java.lang.String expression, java.util.Set<java.lang.String> result) Get the variable names from the given expression.
boolean	isSymbol(SymbolNode symbol1, java.lang.String symbol2Name) Check if the given symbol is a SymbolNode and test if the names are equal.
boolean	isSymbol(SymbolNode symbol1, SymbolNode symbol2) Check if the given symbol is a SymbolNode and test if the names are equal.
ASTNode	optimizeFunction(FunctionNode functionNode) Optimize an already parsed in functionNode into an ASTNode.
ASTNode	parse(java.lang.String expression) Parse the given expression String and store the resulting ASTNode in this DoubleEvaluator
static ASTNode	parseNode(java.lang.String expression, boolean relaxedSyntax) Parse the given expression String and return the resulting ASTNode
void	setCallbackFunction(IDoubleCallbackFunction callbackFunction) Set a callback function for unknown function names.

Methods inherited from class java.lang.Object

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

Field Detail

EPSILON

public static double EPSILON

Constructor Detail

DoubleEvaluator

public DoubleEvaluator()

DoubleEvaluator

public DoubleEvaluator(boolean relaxedSyntax)

DoubleEvaluator

public DoubleEvaluator(ASTNode node,
                       boolean relaxedSyntax)

Method Detail

getCallbackFunction

public IDoubleCallbackFunction getCallbackFunction()

A callback function for unknown function names.

Returns:

the callback function

setCallbackFunction

public void setCallbackFunction(IDoubleCallbackFunction callbackFunction)

Set a callback function for unknown function names.

Parameters:

callbackFunction - the callback function to set

parse

public ASTNode parse(java.lang.String expression)

Parse the given expression String and store the resulting ASTNode in this DoubleEvaluator

Parameters:

expression -

Returns:

Throws:

SyntaxError

parseNode

public static ASTNode parseNode(java.lang.String expression,
                                boolean relaxedSyntax)

Parse the given expression String and return the resulting ASTNode

Parameters:

expression -

Returns:

Throws:

SyntaxError

evaluate

public double evaluate(java.lang.String expression)

Parse the given expression String and evaluate it to a double value

Parameters:

expression -

Returns:

Throws:

SyntaxError

evaluate

public double evaluate()

Reevaluate the expression (possibly after a new Variable assignment)

Parameters:

Expression -

Returns:

Throws:

SyntaxError

evaluateNode

public double evaluateNode(ASTNode node)

Evaluate an already parsed in abstract syntax tree node into a double number value.

Parameters:

node - abstract syntax tree node

Returns:

the evaluated double number

Throws:

ArithmeticMathException - if the node cannot be evaluated.

evaluateFunction

public double evaluateFunction(FunctionNode functionNode)

Evaluate an already parsed in FunctionNode into a souble number value.

Parameters:

functionNode -

Returns:

Throws:

ArithmeticMathException - if the functionNode cannot be evaluated.

isSymbol

public boolean isSymbol(SymbolNode symbol1,
                        java.lang.String symbol2Name)

Check if the given symbol is a SymbolNode and test if the names are equal.

Parameters:

symbol1 -

symbol2Name -

Returns:

isSymbol

public boolean isSymbol(SymbolNode symbol1,
                        SymbolNode symbol2)

Check if the given symbol is a SymbolNode and test if the names are equal.

Parameters:

symbol1 -

symbol2 -

Returns:

derivative

public ASTNode derivative(ASTNode node,
                          java.lang.String var)

Parameters:

node -

var -

Returns:

derivative

public ASTNode derivative(ASTNode node,
                          SymbolNode var)

TODO: add more derivation rules

Parameters:

node -

var -

Returns:

evaluateNodeLogical

public boolean evaluateNodeLogical(ASTNode node)

evaluateFunctionLogical

public boolean evaluateFunctionLogical(FunctionNode functionNode)

optimizeFunction

public ASTNode optimizeFunction(FunctionNode functionNode)

Optimize an already parsed in functionNode into an ASTNode.

Parameters:

functionNode -

Returns:

defineVariable

public void defineVariable(java.lang.String variableName,
                           double value)

Define a value for a given variable name.

Parameters:

variableName -

value -

defineVariable

public void defineVariable(java.lang.String variableName,
                           IDoubleValue value)

Define a value for a given variable name.

Parameters:

variableName -

value -

defineVariable

public void defineVariable(java.lang.String variableName)

Define a value for a given variable name.

Parameters:

variableName -

value -

getVariable

public IDoubleValue getVariable(java.lang.String variableName)

Returns the double variable value to which the specified variableName is mapped, or null if this map contains no mapping for the variableName.

Parameters:

variableName -

Returns:

defineVariable

public void defineVariable(java.lang.String variableName,
                           BooleanVariable value)

Define a boolean value for a given variable name.

Parameters:

variableName -

value -

clearVariables

public void clearVariables()

Clear all defined variables for this evaluator.

getVariables

public void getVariables(java.lang.String expression,
                         java.util.Set<java.lang.String> result)

Get the variable names from the given expression.

Parameters:

expression -

result - a set which contains the variable names

getVariables

public static void getVariables(ASTNode node,
                                java.util.Set<java.lang.String> result)

Get the variable names from the given AST node.

Parameters:

node - an already parsed AST node

result - a set which contains the variable names