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JEP is a Java library for parsing and evaluating mathematical expressions.
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/* @author rich
* Created on 14-Feb-2005
*
* See LICENSE.txt for license information.
*/
package org.lsmp.djep.vectorJep.function;
import org.lsmp.djep.vectorJep.Dimensions;
import org.lsmp.djep.vectorJep.values.*;
import org.nfunk.jep.*;
import org.nfunk.jep.function.CallbackEvaluationI;
import org.nfunk.jep.function.PostfixMathCommand;
/**
* evaluates a function on every element of a vector or matrix.
* Map(x^2,x,[1,2,3]) -> [1,4,9]
* Map(x^y,[x,y],[1,2,3],[1,2,3]) -> [1,4,27]
* First argument is a equation, second argument is the name or names of variables.
* Third and subsequent arguments are vectors or matrices, they must have the same dimensions
* and the number of subsequent arguments must match the number of variables specified in the second argument.
*
* @author Rich Morris
* Created on 14-Feb-2005
*/
public class VMap
extends PostfixMathCommand
implements NaryOperatorI, CallbackEvaluationI
{
/**
*
*/
public VMap()
{
super();
this.numberOfParameters = -1;
}
public Dimensions calcDim(Dimensions[] dims) throws ParseException
{
return dims[2];
}
public MatrixValueI calcValue(MatrixValueI res, MatrixValueI[] inputs)
throws ParseException
{
return null;
}
public static Variable[] getVars(Node varsNode) throws ParseException
{
Variable vars[]=null;
if(varsNode instanceof ASTFunNode
&& ((ASTFunNode) varsNode).getPFMC() instanceof VList )
{
int nVars = varsNode.jjtGetNumChildren();
vars = new Variable[nVars];
for(int i=0;i= 3);
}
public Object evaluate(
Node node,
EvaluatorI pv)
throws ParseException
{
int nChild = node.jjtGetNumChildren();
if(nChild <3)
throw new ParseException("Map must have three or more arguments");
// First find the variables
Variable vars[] = getVars(node.jjtGetChild(1));
if(nChild != vars.length + 2)
throw new ParseException("Map: number of arguments should match number of variables + 2");
// Now evaluate third and subsequent arguments
MatrixValueI inputs[] = new MatrixValueI[nChild-2];
Dimensions dim=null;
for(int i=0;i