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/*
* File: MatrixFactory.java
* Authors: Kevin R. Dixon
* Company: Sandia National Laboratories
* Project: Cognitive Foundry
*
* Copyright May 18, 2007, Sandia Corporation. Under the terms of Contract
* DE-AC04-94AL85000, there is a non-exclusive license for use of this work by
* or on behalf of the U.S. Government. Export of this program may require a
* license from the United States Government. See CopyrightHistory.txt for
* complete details.
*
*/
package gov.sandia.cognition.math.matrix;
import gov.sandia.cognition.collection.CollectionUtil;
import gov.sandia.cognition.math.matrix.mtj.DenseMatrixFactoryMTJ;
import gov.sandia.cognition.math.matrix.mtj.DiagonalMatrixFactoryMTJ;
import gov.sandia.cognition.math.matrix.mtj.SparseMatrixFactoryMTJ;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import java.util.Random;
/**
* Abstract factory for creating {@code Matrix} objects.
*
* @param Type of Matrix created by the factory.
* @author Kevin R. Dixon
* @since 1.0
*/
public abstract class MatrixFactory
extends Object
implements Serializable
{
/** The default dense implementation of a {@code MatrixFactory}. */
protected static final MatrixFactory DEFAULT_DENSE_INSTANCE =
new DenseMatrixFactoryMTJ();
/** The default sparse implementation of a {@code MatrixFactory}. */
protected static final MatrixFactory DEFAULT_SPARSE_INSTANCE =
new SparseMatrixFactoryMTJ();
/**
* The default implementation of a factory that creates a DiagonalMatrix
*/
protected static final DiagonalMatrixFactoryMTJ DEFAULT_DIAGONAL_INSTANCE =
new DiagonalMatrixFactoryMTJ();
/**
* Creates a new {@code MatrixFactory}.
*/
protected MatrixFactory()
{
super();
}
/**
* Gets the default implementation of {@code MatrixFactory}.
*
* @return The default {@code MatrixFactory}.
*/
public static MatrixFactory getDefault()
{
return DEFAULT_DENSE_INSTANCE;
}
/**
* Gets the default implementation of {@code MatrixFactory} for dense
* matrices.
*
* @return The default dense {@code MatrixFactory}.
*/
public static MatrixFactory getDenseDefault()
{
return DEFAULT_DENSE_INSTANCE;
}
/**
* Gets the default implementation of {@code MatrixFactory} for sparse
* matrices.
*
* @return The default sparse {@code MatrixFactory}.
*/
public static MatrixFactory getSparseDefault()
{
return DEFAULT_SPARSE_INSTANCE;
}
/**
* Gets the default implementation of {@code MatrixFactory} for diagonal
* matrices.
*
* @return The default {@code DiagonalMatrixFactory}.
*/
public static MatrixFactory getDiagonalDefault()
{
return DEFAULT_DIAGONAL_INSTANCE;
}
/**
* Creates a deep copy new Matrix given another, argument is unchanged
* @param m Matrix to copy
* @return Deep copy of the given Matrix
*/
public abstract MatrixType copyMatrix(
Matrix m );
/**
* Copies the values from the array into the Matrix
* @param values Values to copy
* @return Matrix with same dimension and values as "values"
*/
public MatrixType copyArray(
double[][] values )
{
int M = values.length;
int N = 0;
if( M > 0 )
{
N = values[0].length;
}
MatrixType m = this.createMatrix( M, N );
for( int i = 0; i < M; i++ )
{
if( values[i].length != N )
{
throw new IllegalArgumentException(
"Array columns are not same size!" );
}
for( int j = 0; j < N; j++ )
{
m.setElement( i,j, values[i][j] );
}
}
return m;
}
/**
* Creates an empty Matrix of the specified dimensions, all elements
* must be all zeros!
* @param numRows number of rows in the Matrix
* @param numColumns number of columns in the Matrix
* @return All-zero empty Matrix of the specified dimensions
*/
public abstract MatrixType createMatrix(
int numRows,
int numColumns );
/**
* Creates a Matrix with ones (1) on the diagonal, and zeros (0) elsewhere
* @param numRows number of rows in the Matrix
* @param numColumns number of columns in the Matrix
* @return Identity Matrix with ones on the diagonal and zeros elsewhere
*/
public MatrixType createIdentity(
int numRows,
int numColumns )
{
MatrixType m = this.createMatrix( numRows, numColumns );
m.identity();
return m;
}
/**
* Creates a new Matrix of the given size with random values for the
* entries, uniformly distributed between the given minimum and maximum
* values.
*
* @param numRows
* The number of rows in the Matrix.
* @param numColumns
* The number of columns in the Matrix.
* @param min
* The minimum range of the uniform distribution.
* @param max
* The maximum range of the uniform distribution.
* @param random
* The random number generator.
* @return
* Matrix with random values for the entries, uniformly distributed
* between the given minimum and maximum values.
*/
public MatrixType createUniformRandom(
int numRows,
int numColumns,
double min,
double max,
Random random)
{
MatrixType m = this.createMatrix( numRows, numColumns );
for( int i = 0; i < m.getNumRows(); i++ )
{
for( int j = 0; j < m.getNumColumns(); j++ )
{
double uniform = random.nextDouble();
double value = ((max-min) * uniform) + min;
m.setElement( i,j, value );
}
}
return m;
}
/**
* Creates a new matrix by copying the given set of row vectors.
*
* @param rows
* The row vectors to create a matrix from. Must all be the same
* dimensionality.
* @return
* A new matrix whose rows are equal to the given set of rows.
*/
public MatrixType copyRowVectors(
final Collection rows)
{
// Create the matrix.
final int numRows = rows.size();
final int numColumns = VectorUtil.safeGetDimensionality(
CollectionUtil.getFirst(rows));
final MatrixType result = this.createMatrix(numRows, numColumns);
// Fill in the matrix with the rows.
int rowIndex = 0;
for (Vectorizable row : rows)
{
result.setRow(rowIndex, row.convertToVector());
rowIndex++;
}
return result;
}
/**
* Creates a new matrix by copying the given set of row vectors.
*
* @param rows
* The row vectors to create a matrix from. Must all be the same
* dimensionality.
* @return
* A new matrix whose rows are equal to the given set of rows.
*/
public MatrixType copyRowVectors(
Vectorizable ... rows )
{
return this.copyRowVectors(Arrays.asList(rows));
}
/**
* Creates a new matrix by copying the given set of column vectors.
*
* @param columns
* The column vectors to create a matrix from. Must all be the same
* dimensionality.
* @return
* A new matrix whose columns are equal to the given set of columns.
*/
public MatrixType copyColumnVectors(
final Collection columns)
{
// Create the matrix.
final int numRows = VectorUtil.safeGetDimensionality(
CollectionUtil.getFirst(columns));
final int numColumns =
columns.size();
final MatrixType result = this.createMatrix(numRows, numColumns);
// Fill in the matrix with the columns.
int columnIndex = 0;
for (Vectorizable column : columns)
{
result.setColumn(columnIndex, column.convertToVector());
columnIndex++;
}
return result;
}
/**
* Creates a new matrix by copying the given set of column vectors.
*
* @param columns
* The column vectors to create a matrix from. Must all be the same
* dimensionality.
* @return
* A new matrix whose columns are equal to the given set of columns.
*/
public MatrixType copyColumnVectors(
Vectorizable ... columns )
{
return this.copyColumnVectors(Arrays.asList(columns));
}
/**
* Creates a matrix with the given initial value.
*
* @param numRows
* The number of rows. Cannot be negative.
* @param numColumns
* The number of columns. Cannot be negative.
* @param initialValue
* The initial value to set all elements to.
* @return
* A Matrix of the given size initialized with the given initial value.
*/
public MatrixType createMatrix(
final int numRows,
final int numColumns,
final double initialValue)
{
final MatrixType result = this.createMatrix(numRows, numColumns);
if (initialValue != 0.0)
{
for (int i = 0; i < numRows; i++)
{
for (int j = 0; j < numColumns; j++)
{
result.setElement(i, j, initialValue);
}
}
}
return result;
}
/**
* Creates a new square matrix whose number of rows and columns match the
* dimensionality of the given vector. It also places the values of the
* vector on the diagonal of the matrix.
*
* @param diagonal
* The vector of diagonal values.
* @return
* A new, square matrix with the diagonal elements equal to the
* elements of the given vector.
*/
public MatrixType createDiagonal(
final Vectorizable diagonal)
{
final Vector vector = diagonal.convertToVector();
final int dimensionality = vector.getDimensionality();
// Create the matrix.
final MatrixType result = this.createMatrix(dimensionality, dimensionality);
// Set the diagonal values.
for (VectorEntry entry : vector)
{
final int i = entry.getIndex();
result.setElement(i, i, entry.getValue());
}
return result;
}
}