/* * RPNcalculatorStatistic.java * * Copyright (c) 2002-2015 Alexei Drummond, Andrew Rambaut and Marc Suchard * * This file is part of BEAST. * See the NOTICE file distributed with this work for additional * information regarding copyright ownership and licensing. * * BEAST is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * BEAST 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with BEAST; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301 USA */ package dr.inference.model; import java.util.Map; /** * A statistic based on evaluating simple expressions. * * The expressions are in RPN, so no parsing issues. whitspace separated. Variables (other statistics), * constants and operations. Currently just the basic four, but easy to extend. * * @author Joseph Heled */ public class RPNcalculatorStatistic extends Statistic.Abstract { private final RPNexpressionCalculator[] expressions; private final String[] names; private final Map<String, Statistic> variables; RPNexpressionCalculator.GetVariable vars = new RPNexpressionCalculator.GetVariable() { public double get(String name) { return variables.get(name).getStatisticValue(0); } }; public RPNcalculatorStatistic(String name, String[] expressions, String[] names, Map<String, Statistic> variables) { super(name); this.expressions = new RPNexpressionCalculator[expressions.length]; for(int i = 0; i < expressions.length; ++ i) { this.expressions[i] = new RPNexpressionCalculator(expressions[i]); String err = this.expressions[i].validate(); if( err != null ) { throw new RuntimeException("Error in expression " + i + ": " + err); } } this.names = names; this.variables = variables; } public int getDimension() { return expressions.length; } public String getDimensionName(int dim) { return names[dim]; } /** @return the value of the expression */ public double getStatisticValue(int dim) { return expressions[dim].evaluate(vars); } }