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JEP is a Java library for parsing and evaluating mathematical expressions.
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/* @author rich
* Created on 25-Oct-2003
*/
package org.lsmp.djep.vectorJep;
/**
* A class to represent a set of dimensions.
* Might be 1 for 0-dimensional numbers.
* [3] for a 3D vector
* [3,3] for a matrix
* @author rich
* Created on 25-Oct-2003
*/
public class Dimensions
{
private int dims[];
public static final Dimensions UNKNOWN = new Dimensions(-1);
public static final Dimensions ONE = new Dimensions(1);
public static final Dimensions TWO = new Dimensions(2);
public static final Dimensions THREE = new Dimensions(3);
private Dimensions() {}
/** Sets the dimension to a single number. Implies its a Scaler or MVector. */
private Dimensions(int d) { dims = new int[] {d}; }
/** Use this method for matrices. */
private Dimensions(int d1,int d2) { dims = new int[] {d1,d2}; }
/** Construct a dimension set from an array. */
private Dimensions(int d[])
{
dims = new int[d.length];
System.arraycopy(d,0,dims,0,d.length);
}
/**
* Factory method returns a Dimension for vector of given length.
* For 1,2,3 returns ONE,TWO or THREE otherwise create a new object.
*/
public static Dimensions valueOf(int d)
{
switch(d) {
case 1: return Dimensions.ONE;
case 2: return Dimensions.TWO;
case 3: return Dimensions.THREE;
default:
return new Dimensions(d);
}
}
/** returns dimensions for a matrix. **/
public static Dimensions valueOf(int rows,int cols)
{
return new Dimensions(rows,cols);
}
/** return a dimension [d,inDim[0],...,inDim[n]] */
public static Dimensions valueOf(int d,Dimensions inDim)
{
Dimensions res = new Dimensions();
res.dims = new int[inDim.rank()+1];
res.dims[0]=d;
for(int i=0;i