ucar.ma2

Class MAVector

java.lang.Object

ucar.ma2.MAVector

public class MAVector
extends Object

Abstraction for vector operations. A vector is a rank-1 Array. All operations done in double precision

Constructor Summary

Constructors

Constructor and Description
MAVector(Array a) Create an MAVector using the given rank-1 array.
MAVector(double[] values) Create an MAVector out of a double array
MAVector(int nelems) Create an MAVector of the given length.

Method Summary

Modifier and Type	Method and Description
MAVector	copy() Create a new MAVector that is the same as this one, with a copy of the backing store.
double	cos(MAVector v) Cos between two vectors = dot(v) / norm() * norm(v)
double	dot(MAVector v) Dot product of 2 vectors
double	getDouble(int i)
int	getNelems()
double	norm() Get the L2 norm of this vector.
void	normalize() Normalize this vector, so it has norm = 1.0.
void	setDouble(int i, double val)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MAVector

public MAVector(double[] values)

Create an MAVector out of a double array

MAVector

public MAVector(int nelems)

Create an MAVector of the given length.

MAVector

public MAVector(Array a)

Create an MAVector using the given rank-1 array.

Parameters:

a - rank-1 array

Throws:

IllegalArgumentException - is a is not rank 1

Method Detail

getNelems

public int getNelems()

getDouble

public double getDouble(int i)

setDouble

public void setDouble(int i,
                      double val)

copy

public MAVector copy()

Create a new MAVector that is the same as this one, with a copy of the backing store.

cos

public double cos(MAVector v)

Cos between two vectors = dot(v) / norm() * norm(v)

Parameters:

v - cosine with this vector

Returns:

double result: cos between this and v

Throws:

IllegalArgumentException - if nelems != v.getNelems().

dot

public double dot(MAVector v)

Dot product of 2 vectors

Parameters:

v - dot product with this vector

Returns:

double result: dot product

Throws:

IllegalArgumentException - if nelems != v.getNelems().

norm

public double norm()

Get the L2 norm of this vector.

Returns:

double norm

normalize

public void normalize()

Normalize this vector, so it has norm = 1.0.