drasys.or.matrix
Class ArrayMatrix

java.lang.Object
  |
  +--drasys.or.matrix.RealContainer
        |
        +--drasys.or.matrix.Matrix
              |
              +--drasys.or.matrix.ArrayMatrix

Direct Known Subclasses:

ColumnArrayMatrix, RowArrayMatrix

public abstract class ArrayMatrix

extends Matrix

implements SizableMatrixI

Abstract base class for array matrices. An array matrix is a dense matrix which holds the rows/columns a java two-dimensional array.

References:

Matrix Computations (Johns Hopkins Studies in the Mathematical Sciences)
    Gene H. Golub, Charles F. Van Loan (Contributor) / Paperback / Published 1996
Numerical Recipes in C : The Art of Scientific Computing
    William H. Press, et al / Hardcover / Published 1993
Parallel Algorithms for Matrix Computations
    K.A. Gallivan / Paperback / Published 1990

See Also:

Serialized Form

Fields inherited from class drasys.or.matrix.RealContainer

_epsilon, _globalEpsilon

 

Constructor Summary

ArrayMatrix(double[][] array)           Constructs a dense matrix the same size as 'array'.

ArrayMatrix(int sizeOfRows, int sizeOfColumns)           Constructs a dense matrix with an explicit size.

 

Method Summary
double[][]	getArray()           Returns a new two-dimensional array containing the values in matrix.
double[][]	getValueArray()           Returns the internal java two-dimensional array that is used to hold the element values.
boolean	isNull(int row, int column)           Returns true if an element has no value associated with it in a sparse matrix.
void	setElements(double value)           Sets the value of all the non-null elements in the matrix.
int	sizeOfColumns()           Returns the number of columns in the matrix.
int	sizeOfRows()           Returns the number of rows in the matrix.

 

Methods inherited from class drasys.or.matrix.Matrix

columnElements, elements, equals, equals, rowElements, setColumn, setDiagonal, setElements, setRow, sum, sum, sum, sumOfSquaredDifferences, sumOfSquaredDifferences, sumOfSquaredDifferences, sumOfSquares, sumOfSquares, sumOfSquares, toString

 

Methods inherited from class drasys.or.matrix.RealContainer

equals, getEpsilon, getGlobalEpsilon, setEpsilon, setGlobalEpsilon

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

ArrayMatrix

public ArrayMatrix(int sizeOfRows,
                   int sizeOfColumns)

Constructs a dense matrix with an explicit size.

ArrayMatrix

public ArrayMatrix(double[][] array)

Constructs a dense matrix the same size as 'array'.

setElements

public void setElements(double value)

Sets the value of all the non-null elements in the matrix.

sizeOfRows

public int sizeOfRows()

Returns the number of rows in the matrix.

sizeOfColumns

public int sizeOfColumns()

Returns the number of columns in the matrix.

isNull

public boolean isNull(int row,
                      int column)

Returns true if an element has no value associated with it in a sparse matrix. Elements which have no value assigned return 0.0 when accessed.

getValueArray

public double[][] getValueArray()

Returns the internal java two-dimensional array that is used to hold the element values. The rows of the array hold the rows or columns of the matrix depending on the subclass.

getArray

public double[][] getArray()

Returns a new two-dimensional array containing the values in matrix. The rows of the array hold the rows of the matrix.

Overrides:

getArray in class Matrix