org.matheclipse.core.eval

Class ExprEvaluator

java.lang.Object

org.matheclipse.core.eval.ExprEvaluator

public class ExprEvaluator
extends java.lang.Object

Evaluate math expressions to IExpr results.

Constructor Summary

Constructors

Constructor and Description
ExprEvaluator() Constructor for an IExpr object evaluator.
ExprEvaluator(boolean outListDisabled, int historyCapacity) Constructor for an IExpr object evaluator.
ExprEvaluator(EvalEngine engine, boolean outListDisabled, int historyCapacity) Constructor for an IExpr object evaluator.

Method Summary

Modifier and Type	Method and Description
void	clearVariables() Clear all defined variables for this evaluator.
ISymbol	defineVariable(ISymbol variable) Define a given variable on the local variable stack without assigning a value.
ISymbol	defineVariable(ISymbol variable, double value) Define a double value for a given variable name.
ISymbol	defineVariable(ISymbol variable, IExpr value) Define a value for a given variable name.
ISymbol	defineVariable(java.lang.String variableName) Define a given variable name on the local variable stack without assigning a value.
void	defineVariable(java.lang.String variableName, boolean value) Define a boolean value for a given variable name.
ISymbol	defineVariable(java.lang.String variableName, double value) Define a double value for a given variable name.
ISymbol	defineVariable(java.lang.String variableName, IExpr value) Define a value for a given variable name.
IExpr	evaluate() Reevaluate the last expression (possibly after a new variable assignment).
IExpr	evaluate(IExpr expr) Evaluate an expression for the given "local variables list".
IExpr	evaluate(java.lang.String inputExpression) Parse the given expression String and evaluate it to an IExpr value
double	evaluateDoube(java.lang.String inputExpression) Parse the given expression String and evaluate it to a double value
EvalEngine	getEvalEngine()
IExpr	getVariable(java.lang.String variableName) Returns the expression value to which the specified variableName is mapped, or null if this map contains no mapping for the variableName.
java.lang.String	toJavaForm(java.lang.String inputExpression) Converts the inputExpression string into a Java Symja expression string.
java.lang.String	toScalaForm(java.lang.String inputExpression) Converts the inputExpression string into a Scala expression and writes the result to the given Writerstring.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprEvaluator

public ExprEvaluator()

Constructor for an IExpr object evaluator. By default no output history for the Out() function is stored in the evaluation engine. $ans won't get evaluate to the last result.

ExprEvaluator

public ExprEvaluator(boolean outListDisabled,
                     int historyCapacity)

Constructor for an IExpr object evaluator. By default no output history for the Out() function is stored in the evaluation engine. $ans won't get evaluate to the last result.

Parameters:

outListDisabled - if false create a LastCalculationsHistory(historyCapacity), otherwise no history of the last calculations will be saved and the Out() function (or $ans variable or the % operator) will be unevaluated.

historyCapacity - the number of last entries of the calculations which should be stored.

ExprEvaluator

public ExprEvaluator(EvalEngine engine,
                     boolean outListDisabled,
                     int historyCapacity)

Constructor for an IExpr object evaluator. By default no output history for the Out() function is stored in the evaluation engine. $ans won't get evaluate to the last result.

Parameters:

outListDisabled - if false create a LastCalculationsHistory(historyCapacity), otherwise no history of the last calculations will be saved and the Out() function (or $ans variable or the % operator) will be unevaluated.

historyCapacity - the number of last entries of the calculations which should be stored.

Method Detail

clearVariables

public void clearVariables()

Clear all defined variables for this evaluator.

defineVariable

public ISymbol defineVariable(ISymbol variable)

Define a given variable on the local variable stack without assigning a value.

Parameters:

variable -

value -

defineVariable

public ISymbol defineVariable(ISymbol variable,
                              double value)

Define a double value for a given variable name.

Parameters:

variable -

value -

defineVariable

public ISymbol defineVariable(ISymbol variable,
                              IExpr value)

Define a value for a given variable name. The value is evauate before it's assigned to the local variable

Parameters:

variable -

value -

defineVariable

public ISymbol defineVariable(java.lang.String variableName)

Define a given variable name on the local variable stack without assigning a value.

Parameters:

variableName -

value -

defineVariable

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

Define a boolean value for a given variable name.

Parameters:

variableName -

value -

defineVariable

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

Define a double value for a given variable name.

Parameters:

variableName -

value -

defineVariable

public ISymbol defineVariable(java.lang.String variableName,
                              IExpr value)

Define a value for a given variable name.

Parameters:

variableName -

value -

evaluate

public IExpr evaluate()

Reevaluate the last expression (possibly after a new variable assignment).

Returns:

Throws:

SyntaxError

evaluate

public IExpr evaluate(IExpr expr)

Evaluate an expression for the given "local variables list". If evaluation is not possible return the input object.

Parameters:

expr - the expression which should be evaluated

Returns:

the evaluated object

evaluate

public IExpr evaluate(java.lang.String inputExpression)

Parse the given expression String and evaluate it to an IExpr value

Parameters:

expression -

Returns:

Throws:

SyntaxError

evaluateDoube

public double evaluateDoube(java.lang.String inputExpression)

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

Parameters:

expression -

Returns:

Throws:

SyntaxError

getEvalEngine

public EvalEngine getEvalEngine()

getVariable

public IExpr getVariable(java.lang.String variableName)

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

Parameters:

variableName -

Returns:

toJavaForm

public java.lang.String toJavaForm(java.lang.String inputExpression)
                            throws MathException

Converts the inputExpression string into a Java Symja expression string.

Parameters:

inputExpression -

out -

Throws:

MathException

toScalaForm

public java.lang.String toScalaForm(java.lang.String inputExpression)
                             throws MathException

Converts the inputExpression string into a Scala expression and writes the result to the given Writerstring.

Parameters:

inputExpression -

out -

Throws:

MathException