sugr.linalg
Class LinearAlgebraFactory

java.lang.Object
  sugr.linalg.LinearAlgebraFactory

public class LinearAlgebraFactory

extends java.lang.Object

Author:

beder

Constructor Summary

LinearAlgebraFactory()

Method Summary

static Matrix	getDiagMatrix(int size, double d) Create new diagonal matrix.
static Matrix	getMatrix(double[][] values) create a new matrix by a given double precision floating point array.
static Matrix	getMatrix(int no_rows, int no_cols) Return a Matrix no_rows x no_cols filled with zeros.
static Matrix	getMatrix(Matrix A) create new Matrix given Matrix.
static Matrix	getMatrix(Vector v) creates a Matrix from a given Vector.
static Matrix	getMatrix(Vector v, int times) creates a Matrix from a given Vector.
static Matrix	getMatrixId(int dim) creates an identity Matrix
static Vector	getVector(double[] values) create a new Vector by a given double precision floating point array.
static Vector	getVector(double a, double b) create a new Vector by 2 doubles
static Vector	getVector(double a, double b, double c) create a new Vector by 3 doubles
static Vector	getVector(double a, double b, double c, double d) create a new Vector by 4 doubles
static Vector	getVector(int size) Return a Vector size x 1 filled with zeros.
static Vector	getVector(Vector v) create new Vector by given Vector.

Methods inherited from class java.lang.Object

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

Constructor Detail

LinearAlgebraFactory

public LinearAlgebraFactory()

Method Detail

getMatrix

public static Matrix getMatrix(int no_rows,
                               int no_cols)

Return a Matrix no_rows x no_cols filled with zeros.

Parameters:

no_rows - Number of rows the matrix should have

no_cols - Number of columns the matrix should have

Returns:

a no_rows x no_cols - Matrix

getVector

public static Vector getVector(int size)

Return a Vector size x 1 filled with zeros.

Parameters:

size - Dimension the vector should have

Returns:

a Vector with dimension size

getMatrix

public static Matrix getMatrix(double[][] values)

create a new matrix by a given double precision floating point array. e.g.:

    double[][] array = {  {0,1,2,3}, 
                          {0,1,2,3}, 
                          {0,1,2,3}};
    Matrix A = LinearAlgebraFactory.getMatrix(array);
 

Matrix A has dimension 3x4.

Parameters:

values - given in double

Returns:

a Matrix

getMatrix

public static Matrix getMatrix(Matrix A)

create new Matrix given Matrix. Functionally it works like copy

Parameters:

A - Matrix to clone

Returns:

a new Matrix with same entries as given Matrix

getDiagMatrix

public static Matrix getDiagMatrix(int size,
                                   double d)

Create new diagonal matrix.

Parameters:

size - the number of rows and columns of the matrix

d - the value the diagonal elements should have

Returns:

a new Matrix

getMatrix

public static Matrix getMatrix(Vector v,
                               int times)

creates a Matrix from a given Vector. May be useful for some matrix-multiplication action (like repmat(v, 1, times))

Parameters:

v - Vector to create Matrix from

times - how often should the vector v be repeated

Returns:

a Matrix with dimension (v.dim() x times)

getVector

public static Vector getVector(double[] values)

create a new Vector by a given double precision floating point array.

Parameters:

values - given in double

Returns:

a Vector with dimension = #entries in array

getVector

public static Vector getVector(double a,
                               double b)

create a new Vector by 2 doubles

Parameters:

a - first double value

b - second double value

Returns:

a Vector with dimension 2

getVector

public static Vector getVector(double a,
                               double b,
                               double c)

create a new Vector by 3 doubles

Parameters:

a - first double value

b - second double value

c - third double value

Returns:

a Vector with dimension 3

getVector

public static Vector getVector(double a,
                               double b,
                               double c,
                               double d)

create a new Vector by 4 doubles

Parameters:

a - first double value

b - second double value

c - third double value

d - fourth double value

Returns:

a Vector with dimension 4

getVector

public static Vector getVector(Vector v)

create new Vector by given Vector. Functionally it works like copy

Parameters:

v - Vector to clone

Returns:

a Vector

getMatrixId

public static Matrix getMatrixId(int dim)

creates an identity Matrix

Parameters:

dim - dimension the Matrix should have

Returns:

a identity-Matrix with dimension dim

getMatrix

public static Matrix getMatrix(Vector v)

creates a Matrix from a given Vector. May be useful for some matrix-multiplication action

Parameters:

v - Vector to create Matrix from

Returns:

a Matrix with dimension (v.dim() x 1)