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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.matrixJep.*;
import org.lsmp.djep.vectorJep.*;
/**
* Compares the speed of matrix operations
* using both VectorJep or MatrixJep.
*/
public class MatrixSpeed {
static MatrixJep mj;
static VectorJep vj;
static int num_itts = 100000; // for normal use
// static int num_itts = 1000; // for use with profiler
public static void main(String args[]) {
long t1 = System.currentTimeMillis();
initVec();
long t2 = System.currentTimeMillis();
System.out.println("Vec initialise "+(t2-t1));
initMat();
long t3 = System.currentTimeMillis();
System.out.println("Mat initialise "+(t3-t2));
doBoth("y=[[1,2,3],[3,4,5],[6,7,8]]","y*y");
doBoth("y=[[1,2,3],[3,4,5],[6,7,8]]","y+y");
doBoth("y=[[1,2,3],[3,4,5],[6,7,8]]","y-y");
doBoth("y=[[1,2,3],[3,4,5],[6,7,8]]","y*y+y");
doBoth("y=[1,2,3]","y+y");
doBoth("y=[1,2,3]","y . y");
doBoth("y=[1,2,3]","y^^y");
}
public static void doBoth(String eqn1,String eqn2)
{
System.out.println("Testing speed for <"+eqn1+"> and <"+eqn2+">");
doVec(eqn1,eqn2);
doMat(eqn1,eqn2);
}
static void initVec()
{
vj = new VectorJep();
vj.addStandardConstants();
vj.addStandardFunctions();
vj.addComplex();
vj.setAllowUndeclared(true);
vj.setImplicitMul(true);
vj.setAllowAssignment(true);
}
static void doVec(String eqn1,String eqn2)
{
// System.out.println("vec init"+(t4-t3));
try
{
Node node1 = vj.parse(eqn1);
vj.evaluate(node1);
Node node = vj.parse(eqn2);
long t1 = System.currentTimeMillis();
// System.out.println("vec parse"+(t1-t4));
for(int i=0;i