Statistics
Class Vector

java.lang.Object
  Statistics.Vector

public class Vector

extends java.lang.Object

Provides static methods for component by component operations on double[ ]s. Used in the class RandomVector. No vector objects are intended to be instantiated. Vectors are treated as double[ ]s.

WARNING: in binary operations both doubles[ ] must be of the same length but this is not checked. The first double[ ] determines the dimension of the result. If it is shorter than the second double[ ] this leads to truncation if it is longer to an OutOfBoundsException.

Constructor Summary

Vector()

Method Summary

static double[]	add(double[] X, double[] Y) Adds Y to X and returns the updated double[ ] X.
static double[]	mult(double[] X, double[] Y) Componentwise multiplication.
static void	print(double[] X) Componentwise square root.
static double[]	scalarMult(double f, double[] X) Scalar multiplication.
static void	setZero(double[] X) Sets all components of the vector X equal to zero.
static double[]	sqrt(double[] X) Componentwise square root.
static double[]	subtract(double[] X, double[] Y) Subtracts Y from X and returns the updated double[ ] X.

Methods inherited from class java.lang.Object

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

Constructor Detail

Vector

public Vector()

Method Detail

setZero

public static void setZero(double[] X)

Sets all components of the vector X equal to zero.

add

public static double[] add(double[] X,
                           double[] Y)

Adds Y to X and returns the updated double[ ] X.

subtract

public static double[] subtract(double[] X,
                                double[] Y)

Subtracts Y from X and returns the updated double[ ] X.

mult

public static double[] mult(double[] X,
                            double[] Y)

Componentwise multiplication. Multiplies the components of X with the corresponding components of Y and returns the updated double[ ] X.

scalarMult

public static double[] scalarMult(double f,
                                  double[] X)

Scalar multiplication. Multiplies the components of X with the scalar f and returns the updated double[ ] X.

sqrt

public static double[] sqrt(double[] X)

Componentwise square root. Replaces each component of X with its square root and returns the updated double[ ] X.

print

public static void print(double[] X)

Componentwise square root. Replaces each component of X with its square root and returns the updated double[ ] X.