Package edu.cmu.tetrad.calculator.expression

Interface Expression

All Superinterfaces:

Serializable, TetradSerializable

All Known Implementing Classes:

ConstantExpression, EvaluationExpression, VariableExpression

public interface Expression
extends TetradSerializable

Represents a mathematical expression. Used in the Calculator and the Generalized Sem model.

Note that expressions form trees. Each expression has a (possibly empty) list of children.

Version:

$Id: $Id

Author:

Tyler Gibson

Field Summary

Fields

Modifier and Type	Field	Description
static final long	serialVersionUID	Constant serialVersionUID=23L

Method Summary

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

Field Details

serialVersionUID

static final long serialVersionUID

Constant serialVersionUID=23L

See Also:

• Constant Field Values

Method Details

evaluate

double evaluate(Context context)

Evaluates the expression using the given context

Parameters:

context - a Context object

Returns:

a double

getToken

String getToken()

getToken.

Returns:

the token for this expression=="+".

getPosition

ExpressionDescriptor.Position getPosition()

getPosition.

Returns:

the position, infix or not.

getExpressions

List<Expression> getExpressions()

getExpressions.

Returns:

the sub expressions of this expression.

getRealDistribution

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

getRealDistribution.

Parameters:

context - a Context object

Returns:

a RealDistribution object

getIntegerDistribution

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

getIntegerDistribution.

Parameters:

context - a Context object

Returns:

a IntegerDistribution object