jsat.linear

Class DenseMatrix

java.lang.Object

jsat.linear.Matrix

jsat.linear.GenericMatrix

jsat.linear.DenseMatrix

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class DenseMatrix
extends GenericMatrix

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DenseMatrix(double[][] matrix) Creates a new matrix that is a clone of the given matrix.
DenseMatrix(int rows, int cols) Creates a new matrix of zeros
DenseMatrix(Matrix toCopy) Creates a new dense matrix that has a copy of all the same values as the given one
DenseMatrix(Vec a, Vec b) Creates a new matrix based off the given vectors.

Method Summary

Modifier and Type	Method and Description
void	changeSize(int newRows, int newCols) This method alters the size of a matrix, either adding or subtracting rows from the internal structure of the matrix.
DenseMatrix	clone()
int	cols() Returns the number of columns stored in this matrix
double	get(int i, int j) Returns the value stored at at the matrix position Ai,j
Vec	getRowView(int r) Obtains a vector that is backed by this, at very little memory cost.
boolean	isSparce() Returns true if the matrix is sparse, false otherwise
Matrix[]	lup()
Matrix[]	lup(java.util.concurrent.ExecutorService threadPool)
void	multiply(Matrix b, Matrix C) Alters the matrix C to be equal to C = C+A*B
void	multiply(Matrix b, Matrix C, java.util.concurrent.ExecutorService threadPool) Alters the matrix C to be equal to C = C+A*B
void	multiply(Vec b, double z, Vec c) If this matrix is Am x n, and b has a length of n, and c has a length of m, then this will mutate c to store c = c + A*b*z
void	mutableAdd(double c, Matrix b) Alters the current matrix to store the value A+c*B
void	mutableMultiply(double c) Alters the current matrix to be equal to A*c
void	mutableTranspose() Transposes the current matrix in place, altering its value.
Matrix[]	qr()
Matrix[]	qr(java.util.concurrent.ExecutorService threadPool)
int	rows() Returns the number of rows stored in this matrix
void	set(int i, int j, double value) Sets the value stored at at the matrix position Ai,j
void	swapRows(int r1, int r2) Alters the current matrix by swapping the values stored in two different rows.
DenseMatrix	transpose() Returns a new matrix that is the transpose of this matrix.
void	transpose(Matrix C) Overwrites the values stored in matrix C to store the value of A'
void	transposeMultiply(double c, Vec b, Vec x) Alters the vector x to be equal to x = x + A'*b*c
void	transposeMultiply(Matrix b, Matrix C) Alters the matrix C so that C = C + A'*B
void	transposeMultiply(Matrix b, Matrix C, java.util.concurrent.ExecutorService threadPool) Alters the matrix C so that C = C + A'*B
void	zeroOut() Alters the current matrix so that all values are equal to zero.

Methods inherited from class jsat.linear.GenericMatrix

multiplyTranspose, multiplyTranspose, mutableAdd, mutableAdd, mutableAdd, mutableMultiply

Methods inherited from class jsat.linear.Matrix

add, add, add, add, canBeMutated, canMultiply, copyTo, diag, diagMult, diagMult, equals, equals, eye, getColumn, getColumnView, getRow, increment, isSquare, isSymmetric, isSymmetric, multiply, multiply, multiply, multiply, multiply, multiplyTranspose, multiplyTranspose, mutableAdd, mutableAdd, mutableSubtract, mutableSubtract, mutableSubtract, mutableSubtract, mutableSubtract, mutableSubtract, nnz, OuterProductUpdate, OuterProductUpdate, pascal, random, sameDimensions, subtract, subtract, subtract, subtract, toString, transposeMultiply, transposeMultiply, transposeMultiply, updateRow

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DenseMatrix

public DenseMatrix(Vec a,
                   Vec b)

Creates a new matrix based off the given vectors.

Parameters:

a - the first Vector, this new Matrix will have as many rows as the length of this vector

b - the second Vector, this new Matrix will have as many columns as this length of this vector

DenseMatrix

public DenseMatrix(int rows,
                   int cols)

Creates a new matrix of zeros

Parameters:

rows - the number of rows

cols - the number of columns

DenseMatrix

public DenseMatrix(double[][] matrix)

Creates a new matrix that is a clone of the given matrix. An error will be throw if the rows of the given matrix are not all the same size

Parameters:

matrix - the matrix to clone the values of

DenseMatrix

public DenseMatrix(Matrix toCopy)

Creates a new dense matrix that has a copy of all the same values as the given one

Parameters:

toCopy - the matrix to copy

Method Detail

mutableAdd

public void mutableAdd(double c,
                       Matrix b)

Description copied from class: Matrix

Alters the current matrix to store the value A+c*B

Overrides:

mutableAdd in class GenericMatrix

Parameters:

c - the scalar constant to multiple B by

b - the matrix to add to this

multiply

public void multiply(Vec b,
                     double z,
                     Vec c)

Description copied from class: Matrix

If this matrix is A_{m x n}, and b has a length of n, and c has a length of m, then this will mutate c to store c = c + A*b*z

Overrides:

multiply in class GenericMatrix

Parameters:

b - the vector to be treated as a colum vector

z - the constant to multiply the A*b value by.

c - where to place the result by addition

transposeMultiply

public void transposeMultiply(double c,
                              Vec b,
                              Vec x)

Description copied from class: Matrix

Alters the vector x to be equal to x = x + A'*b*c

Overrides:

transposeMultiply in class GenericMatrix

Parameters:

c - the scalar constant to multiply by

b - the vector to multiply by

x - the vector the add the result to

changeSize

public void changeSize(int newRows,
                       int newCols)

Description copied from class: Matrix

This method alters the size of a matrix, either adding or subtracting rows from the internal structure of the matrix. Every resize call may cause a new allocation internally, and should not be called for excessive changing of a matrix. All added rows/ columns will have values of zero. If a row / column is removed, it is always the bottom/right most row / column removed. Values of the removed rows / columns will be lost.

Specified by:

changeSize in class Matrix

Parameters:

newRows - the new number of rows, must be positive

newCols - the new number of columns, must be positive.

transposeMultiply

public void transposeMultiply(Matrix b,
                              Matrix C)

Description copied from class: Matrix

Alters the matrix C so that C = C + A'*B

Overrides:

transposeMultiply in class GenericMatrix

Parameters:

b - the matrix to multiply by

C - the matrix to add the result to

transposeMultiply

public void transposeMultiply(Matrix b,
                              Matrix C,
                              java.util.concurrent.ExecutorService threadPool)

Description copied from class: Matrix

Alters the matrix C so that C = C + A'*B

Overrides:

transposeMultiply in class GenericMatrix

Parameters:

b - the matrix to multiply by

C - the matrix to place the results in

threadPool - the source of threads to do computation in parallel

multiply

public void multiply(Matrix b,
                     Matrix C)

Description copied from class: Matrix

Alters the matrix C to be equal to C = C+A*B

Overrides:

multiply in class GenericMatrix

Parameters:

b - the matrix to multiply this with

C - the matrix to add the result to

multiply

public void multiply(Matrix b,
                     Matrix C,
                     java.util.concurrent.ExecutorService threadPool)

Description copied from class: Matrix

Alters the matrix C to be equal to C = C+A*B

Overrides:

multiply in class GenericMatrix

Parameters:

b - the matrix to multiply this with

C - the matrix to add the result to

threadPool - the source of threads to do computation in parallel

mutableMultiply

public void mutableMultiply(double c)

Description copied from class: Matrix

Alters the current matrix to be equal to A*c

Overrides:

mutableMultiply in class GenericMatrix

Parameters:

c - the scalar constant to multiply by

mutableTranspose

public void mutableTranspose()

Description copied from class: Matrix

Transposes the current matrix in place, altering its value. Only valid for square matrices

Overrides:

mutableTranspose in class GenericMatrix

transpose

public DenseMatrix transpose()

Description copied from class: Matrix

Returns a new matrix that is the transpose of this matrix.

Overrides:

transpose in class Matrix

Returns:

a new matrix A'

transpose

public void transpose(Matrix C)

Description copied from class: Matrix

Overwrites the values stored in matrix C to store the value of A'

Overrides:

transpose in class GenericMatrix

Parameters:

C - the matrix to store the transpose of the current matrix

get

public double get(int i,
                  int j)

Description copied from class: Matrix

Returns the value stored at at the matrix position A_i,j

Specified by:

get in class Matrix

Parameters:

i - the row, starting from 0

j - the column, starting from 0

Returns:

the value at A_i,j

set

public void set(int i,
                int j,
                double value)

Description copied from class: Matrix

Sets the value stored at at the matrix position A_i,j

Specified by:

set in class Matrix

Parameters:

i - the row, starting from 0

j - the column, starting from 0

value - the value to place at A_i,j

rows

public int rows()

Description copied from class: Matrix

Returns the number of rows stored in this matrix

Specified by:

rows in class Matrix

Returns:

the number of rows stored in this matrix

cols

public int cols()

Description copied from class: Matrix

Returns the number of columns stored in this matrix

Specified by:

cols in class Matrix

Returns:

the number of columns stored in this matrix

isSparce

public boolean isSparce()

Description copied from class: Matrix

Returns true if the matrix is sparse, false otherwise

Specified by:

isSparce in class Matrix

Returns:

true if the matrix is sparse, false otherwise

swapRows

public void swapRows(int r1,
                     int r2)

Description copied from class: Matrix

Alters the current matrix by swapping the values stored in two different rows.

Overrides:

swapRows in class GenericMatrix

Parameters:

r1 - the first row to swap

r2 - the second row to swap

zeroOut

public void zeroOut()

Description copied from class: Matrix

Alters the current matrix so that all values are equal to zero.

Overrides:

zeroOut in class GenericMatrix

getRowView

public Vec getRowView(int r)

Description copied from class: Matrix

Obtains a vector that is backed by this, at very little memory cost. Mutations to this vector will alter the values stored in the matrix, and vice versa.

Overrides:

getRowView in class Matrix

Parameters:

r - the row to obtain a view of

Returns:

a vector backed by the specified row of the matrix

lup

public Matrix[] lup()

Overrides:

lup in class GenericMatrix

lup

public Matrix[] lup(java.util.concurrent.ExecutorService threadPool)

Overrides:

lup in class GenericMatrix

qr

public Matrix[] qr()

Overrides:

qr in class GenericMatrix

qr

public Matrix[] qr(java.util.concurrent.ExecutorService threadPool)

Overrides:

qr in class GenericMatrix

clone

public DenseMatrix clone()

Overrides:

clone in class GenericMatrix