org.lsmp.djep.vectorJep
Class Dimensions

java.lang.Object
  org.lsmp.djep.vectorJep.Dimensions

public class Dimensions

extends java.lang.Object

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

Field Summary

static Dimensions	ONE
static Dimensions	THREE
static Dimensions	TWO

Method Summary

boolean	equals(Dimensions dims2) Two dimensions are equal if the element of dims are the same.
int	getFirstDim() get the first dimension, 1 for numbers, or the length of a vector.
int	getIthDim(int i)
int	getLastDim() get the last dimension, 1 for numbers, or the length of a vector.
int	hashcode() apparently your should always override hashcode when you operride equals (Effective Java, Bloch).
boolean	is0D() Is it 0D, ie a simple number.
boolean	is1D() Is it 1D, ie a vector [1,2,3].
boolean	is2D() Is it 2D, ie a matrix [[1,2,3],[4,5,6]].
int	numEles() The total number of elements.
int	rank() rank of dimensions 0 for numbers, 1 for vectors, 2 for matricies
java.lang.String	toString() A string repsesentation.
static Dimensions	valueOf(Dimensions inDim, int d) return a dimension [inDim[0],...
static Dimensions	valueOf(int d) Factory method returns a Dimension for vector of given length.
static Dimensions	valueOf(int[] dims) returns a dimensions with given dimensions.
static Dimensions	valueOf(int d, Dimensions inDim) return a dimension [d,inDim[0],...
static Dimensions	valueOf(int rows, int cols) returns dimensions for a matrix.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ONE

public static final Dimensions ONE

TWO

public static final Dimensions TWO

THREE

public static final Dimensions THREE

Method Detail

valueOf

public static Dimensions valueOf(int d)

Factory method returns a Dimension for vector of given length. For 1,2,3 returns ONE,TWO or THREE otherwise create a new object.

valueOf

public static Dimensions valueOf(int rows,
                                 int cols)

returns dimensions for a matrix.

valueOf

public static Dimensions valueOf(int d,
                                 Dimensions inDim)

return a dimension [d,inDim[0],...,inDim[n]]

valueOf

public static Dimensions valueOf(Dimensions inDim,
                                 int d)

return a dimension [inDim[0],...,inDim[n],d]

valueOf

public static Dimensions valueOf(int[] dims)

returns a dimensions with given dimensions.

getFirstDim

public int getFirstDim()

get the first dimension, 1 for numbers, or the length of a vector. for a matrix [[1,2,3],[4,5,6]] first dim is number of rows eg 2

getLastDim

public int getLastDim()

get the last dimension, 1 for numbers, or the length of a vector. for a matrix [[1,2,3],[4,5,6]] last dim is number of cols eg 3

getIthDim

public int getIthDim(int i)

is0D

public boolean is0D()

Is it 0D, ie a simple number.

is1D

public boolean is1D()

Is it 1D, ie a vector [1,2,3].

is2D

public boolean is2D()

Is it 2D, ie a matrix [[1,2,3],[4,5,6]].

numEles

public int numEles()

The total number of elements. Produce of all the dimensions.

rank

public int rank()

rank of dimensions 0 for numbers, 1 for vectors, 2 for matricies

toString

public java.lang.String toString()

A string repsesentation. Either 1,n,[m,n],[l,m,n] etc.

equals

public boolean equals(Dimensions dims2)

Two dimensions are equal if the element of dims are the same.

hashcode

public int hashcode()

apparently your should always override hashcode when you operride equals (Effective Java, Bloch).