edu.cmu.tetrad.calculator.expression.Expression Maven / Gradle / Ivy
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// For information as to what this class does, see the Javadoc, below. //
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, //
// 2007, 2008, 2009, 2010, 2014, 2015, 2022 by Peter Spirtes, Richard //
// Scheines, Joseph Ramsey, and Clark Glymour. //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program; if not, write to the Free Software //
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA //
///////////////////////////////////////////////////////////////////////////////
package edu.cmu.tetrad.calculator.expression;
import edu.cmu.tetrad.util.TetradSerializable;
import org.apache.commons.math3.distribution.IntegerDistribution;
import org.apache.commons.math3.distribution.RealDistribution;
import java.util.List;
/**
* 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.
*
* @author Tyler Gibson
*/
public interface Expression extends TetradSerializable {
long serialVersionUID = 23L;
/**
* Evaluates the expression using the given context
*/
double evaluate(Context context);
/**
* @return the token for this expression=="+".
*/
String getToken();
/**
* @return the position, infix or not.
*/
ExpressionDescriptor.Position getPosition();
/**
* @return the sub expressions of this expression.
*/
List getExpressions();
/**
*
*/
RealDistribution getRealDistribution(Context context);
/**
*
*/
IntegerDistribution getIntegerDistribution(Context context);
}