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JEP is a Java library for parsing and evaluating mathematical expressions. Use groupId org.fudaa to deploy it in maven central
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/* @author rich
* Created on 07-Jul-2003
*/
package org.lsmp.djep.vectorJep.values;
import org.lsmp.djep.vectorJep.*;
//import JSci.maths.DoubleMatrix;
//import JSci.physics.relativity.Rank1Tensor;
/**
* Represents a matrix.
*
* @author Rich Morris
* Created on 07-Jul-2003
* @version 2.3.0.2 now extends number
* @version 2.3.1.1 Bug with non square matrices fixed.
* @since 2.3.2 Added equals method.
*/
public class Matrix implements MatrixValueI
{
public MatrixValueI copy() {
Matrix tmp = new Matrix(this.rows,this.cols);
tmp.setEles(this);
return tmp;
}
// want package access to simplify addition of matrices
int rows=0;
int cols=0;
Object data[][] = null;
Dimensions dims;
private Matrix() {}
/** Construct a matrix with given rows and cols. */
protected Matrix(int rows,int cols)
{
this.rows = rows;
this.cols = cols;
data = new Object[rows][cols];
dims = Dimensions.valueOf(rows,cols);
}
public static MatrixValueI getInstance(int rows,int cols) {
return new Matrix(rows,cols);
}
/**
* Construct a Matrix from a set of row vectors.
* @param vecs
*/
/*
public Matrix(MVector[] vecs) throws ParseException
{
if(vecs==null) { throw new ParseException("Tried to create a matrix with null row vectors"); }
rows = vecs.length;
if(rows==0) { throw new ParseException("Tried to create a matrix with zero row vectors"); }
// now check that each vector has the same size.
cols = vecs[0].size();
for(int i = 1;i0) sb.append(',');
sb.append('[');
for(int j=0;j0)sb.append(',');
sb.append(data[i][j]);
}
sb.append(']');
}
sb.append(']');
return sb.toString();
}
public Dimensions getDim() { return dims; }
public int getNumEles() { return rows*cols; }
public int getNumRows() { return rows; }
public int getNumCols() { return cols; }
public void setEle(int n,Object value)
{
int i = n / cols;
int j = n % cols;
data[i][j] = value;
}
public void setEle(int i,int j,Object value)
{
data[i][j] = value;
}
public Object getEle(int n)
{
int i = n / cols;
int j = n % cols;
return data[i][j];
}
public Object getEle(int i,int j)
{
return data[i][j];
}
public Object[][] getEles()
{
return data;
}
/** sets the elements to those of the arguments. */
public void setEles(MatrixValueI val)
{
if(!dims.equals(val.getDim())) return;
for(int i=0;i>32));
// int yi = (int)(yl^(yl>>32));
for(int i=0;i