Package edu.cmu.tetrad.calculator.expression

Class ConstantExpression

java.lang.Object

edu.cmu.tetrad.calculator.expression.ConstantExpression

All Implemented Interfaces:

Expression, TetradSerializable, Serializable

public class ConstantExpression
extends Object
implements Expression

Represents a constant expression, that is an expression that always evaluates to the same value.

Author:

Tyler Gibson

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final ConstantExpression	E	Constant expression for e.
static final ConstantExpression	PI	Constant expression for PI.

Constructor Summary

Constructors

Constructor	Description
ConstantExpression(double value)	Constructs the constant expression given the value to use.

Method Summary

Modifier and Type	Method	Description
double	evaluate(Context context)	Evaluates the expression using the given context
List<Expression>	getExpressions()
org.apache.commons.math3.distribution.IntegerDistribution	getIntegerDistribution(Context context)
String	getName()
ExpressionDescriptor.Position	getPosition()
org.apache.commons.math3.distribution.RealDistribution	getRealDistribution(Context context)
String	getToken()
static ConstantExpression	serializableInstance()
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

PI

public static final ConstantExpression PI

Constant expression for PI.

E

public static final ConstantExpression E

Constant expression for e.

Constructor Details

ConstantExpression

public ConstantExpression(double value)

Constructs the constant expression given the value to use.

Method Details

serializableInstance

public static ConstantExpression serializableInstance()

getName

public String getName()

Returns:

the name of the constant or null if there isn't one.

evaluate

public double evaluate(Context context)

Description copied from interface: Expression

Evaluates the expression using the given context

Specified by:

evaluate in interface Expression

Returns:

the constant value.

getToken

public String getToken()

Specified by:

getToken in interface Expression

Returns:

the token for this expression=="+".

getPosition

public ExpressionDescriptor.Position getPosition()

Specified by:

getPosition in interface Expression

Returns:

the position, infix or not.

getExpressions

public List<Expression> getExpressions()

Specified by:

getExpressions in interface Expression

Returns:

the sub expressions of this expression.

toString

public String toString()

Overrides:

toString in class Object

getRealDistribution

public org.apache.commons.math3.distribution.RealDistribution getRealDistribution(Context context)

Specified by:

getRealDistribution in interface Expression

getIntegerDistribution

public org.apache.commons.math3.distribution.IntegerDistribution getIntegerDistribution(Context context)

Specified by:

getIntegerDistribution in interface Expression