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JEP is a Java library for parsing and evaluating mathematical expressions.
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/* @author rich
* Created on 26-Feb-2004
*/
package org.lsmp.djepExamples;
import org.nfunk.jep.*;
import org.lsmp.djep.rpe.*;
/**
* Examples using vectors and matricies
*/
public class RpExample {
static JEP j;
public static void main(String args[]) {
j = new JEP();
j.addStandardConstants();
j.addStandardFunctions();
j.addComplex();
j.setAllowUndeclared(true);
j.setImplicitMul(true);
j.setAllowAssignment(true);
// parse and evaluate each equation in turn
doStuff("1*2*3+4*5*6+7*8*9");
doAll(new String[]{"x1=1","x2=2","x3=3","x4=4","x5=5","x6=6","x7=7","x8=8","x9=9",
"x1*x2*x3+x4*x5*x6+x7*x8*x9"});
doAll(new String[]{"x=0.7","cos(x)^2+sin(x)^2"});
// vectors and matricies can be used with assignment
// doStuff("x=[1,2,3]"); // Value: [1.0,2.0,3.0]
// doStuff("x+x"); // Value: [2.0,4.0,6.0]
// doStuff("x . x"); // Value: 14.0
// doStuff("x^x"); // Value: [0.0,0.0,0.0]
// doStuff("y=[[1,2],[3,4]]"); // Value: [[1.0,2.0],[3.0,4.0]]
// doStuff("y * y"); // Value: [[7.0,10.0],[15.0,22.0]]
// accessing the elements on an array or vector
// doStuff("ele(x,2)"); // Value: 2.0
// doStuff("ele(y,[1,2])"); // Value: 2.0
// using differentation
// doStuff("x=2"); // 2.0
// doStuff("y=[x^3,x^2,x]"); // [8.0,4.0,2.0]
// doStuff("z=diff(y,x)"); // [12.0,4.0,1.0]
// doStuff("diff([x^3,x^2,x],x)");
// System.out.println("dim(z) "+((MatrixVariableI) j.getVar("z")).getDimensions());
}
public static void extendedPrint(RpCommandList list) throws ParseException
{
int num = list.getNumCommands();
for(int i=0;i