ucar.ma2

Class MAVector

java.lang.Object

ucar.ma2.MAVector

public class MAVector
extends java.lang.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(Array a)

Create an MAVector using the given rank-1 array.

Parameters:

a - rank-1 array

Throws:

java.lang.IllegalArgumentException - is a is not rank 1

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.

Method Detail

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:

java.lang.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:

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

getDouble

public double getDouble(int i)

getNelems

public int 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.

setDouble

public void setDouble(int i,
                      double val)