org.lsmp.djep.xjep.function.Sum Maven / Gradle / Ivy
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JEP is a Java library for parsing and evaluating mathematical expressions.
/* @author rich
* Created on 18-Nov-2003
*/
package org.lsmp.djep.xjep.function;
import org.nfunk.jep.*;
import org.nfunk.jep.function.*;
/**
* A sum function Sum(x^2,x,1,10) finds the sum of x^2 with x running from 1 to 10.
* Sum(x^2,x,1,10,2) calculates the 1^2+3^2+5^2+7^2+9^2 i.e. in steps of 2.
* @author Rich Morris
* Created on 10-Sept-2004
*/
public class Sum extends SumType {
static Add add;
private Sum() {}
public Sum(JEP j)
{
super("Sum");
add = (Add) j.getOperatorSet().getAdd().getPFMC();
}
public Object evaluate(Object elements[]) throws ParseException
{
Object ret;
ret = elements[0];
for(int i=1;i