cern.colt.matrix.tint.impl
Class SparseCCMIntMatrix2D

java.lang.Object
  cern.colt.PersistentObject
      cern.colt.matrix.AbstractMatrix
          cern.colt.matrix.AbstractMatrix2D
              cern.colt.matrix.tint.IntMatrix2D
                  cern.colt.matrix.tint.impl.WrapperIntMatrix2D
                      cern.colt.matrix.tint.impl.SparseCCMIntMatrix2D

All Implemented Interfaces:

Serializable, Cloneable

public class SparseCCMIntMatrix2D
extends WrapperIntMatrix2D

Sparse column-compressed-modified 2-d matrix holding int elements. Each column is stored as SparseIntMatrix1D.

Author:

Piotr Wendykier (piotr.wendykier@gmail.com)

See Also:

Serialized Form

Constructor Summary

SparseCCMIntMatrix2D(int rows, int columns)
Constructs a matrix with a given number of rows and columns.

Method Summary

SparseIntMatrix1D[]	elements() Returns the elements of this matrix.
int	getQuick(int row, int column) Returns the matrix cell value at coordinate [row,column].
IntMatrix2D	like(int rows, int columns) Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of rows and columns.
void	setQuick(int row, int column, int value) Sets the matrix cell at coordinate [row,column] to the specified value.
void	trimToSize() Releases any superfluous internal memory.
SparseIntMatrix1D	viewColumn(int column) Constructs and returns a new slice view representing the rows of the given column.

Methods inherited from class cern.colt.matrix.tint.impl.WrapperIntMatrix2D

assign, assign, equals, equals, like1D, vectorize, viewColumnFlip, viewDice, viewPart, viewRow, viewRowFlip, viewSelection, viewStrides

Methods inherited from class cern.colt.matrix.tint.IntMatrix2D

aggregate, aggregate, aggregate, aggregate, assign, assign, assign, assign, assign, assign, assign, cardinality, copy, forEachNonZero, get, getMaxLocation, getMinLocation, getNegativeValues, getNonZeros, getPositiveValues, like, set, toArray, toString, viewSelection, viewSelection, viewSorted, zMult, zMult, zMult, zMult, zSum

Methods inherited from class cern.colt.matrix.AbstractMatrix2D

checkShape, checkShape, columns, columnStride, index, rows, rowStride, size, toStringShort

Methods inherited from class cern.colt.matrix.AbstractMatrix

ensureCapacity, isView

Methods inherited from class cern.colt.PersistentObject

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

SparseCCMIntMatrix2D

public SparseCCMIntMatrix2D(int rows,
                            int columns)

Constructs a matrix with a given number of rows and columns. All entries are initially 0.

Parameters:

rows - the number of rows the matrix shall have.

columns - the number of columns the matrix shall have.

Throws:

IllegalArgumentException - if rows<0 || columns<0 || (double)columns*rows > Integer.MAX_VALUE .

Method Detail

elements

public SparseIntMatrix1D[] elements()

Description copied from class: IntMatrix2D

Returns the elements of this matrix.

Overrides:

elements in class WrapperIntMatrix2D

Returns:

the elements

getQuick

public int getQuick(int row,
                    int column)

Description copied from class: IntMatrix2D

Returns the matrix cell value at coordinate [row,column].

Provided with invalid parameters this method may return invalid objects without throwing any exception. You should only use this method when you are absolutely sure that the coordinate is within bounds. Precondition (unchecked): 0 <= column < columns() && 0 <= row < rows().

Overrides:

getQuick in class WrapperIntMatrix2D

Parameters:

row - the index of the row-coordinate.

column - the index of the column-coordinate.

Returns:

the value at the specified coordinate.

setQuick

public void setQuick(int row,
                     int column,
                     int value)

Description copied from class: IntMatrix2D

Sets the matrix cell at coordinate [row,column] to the specified value.

Provided with invalid parameters this method may access illegal indexes without throwing any exception. You should only use this method when you are absolutely sure that the coordinate is within bounds. Precondition (unchecked): 0 <= column < columns() && 0 <= row < rows().

Overrides:

setQuick in class WrapperIntMatrix2D

Parameters:

row - the index of the row-coordinate.

column - the index of the column-coordinate.

value - the value to be filled into the specified cell.

trimToSize

public void trimToSize()

Description copied from class: AbstractMatrix

Releases any superfluous internal memory. An application can use this operation to minimize the storage of the receiver.

This default implementation does nothing. Override this method if necessary.

Overrides:

trimToSize in class AbstractMatrix

viewColumn

public SparseIntMatrix1D viewColumn(int column)

Description copied from class: IntMatrix2D

Constructs and returns a new slice view representing the rows of the given column. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa. To obtain a slice view on subranges, construct a sub-ranging view ( viewPart(...)), then apply this method to the sub-range view.

Example:

2 x 3 matrix: 1, 2, 3 4, 5, 6

viewColumn(0) ==>

Matrix1D of size 2: 1, 4

Overrides:

viewColumn in class WrapperIntMatrix2D

Parameters:

column - the column to fix.

Returns:

a new slice view.

See Also:

IntMatrix2D.viewRow(int)

like

public IntMatrix2D like(int rows,
                        int columns)

Description copied from class: IntMatrix2D

Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of rows and columns. For example, if the receiver is an instance of type DenseIntMatrix2D the new matrix must also be of type DenseIntMatrix2D, if the receiver is an instance of type SparseIntMatrix2D the new matrix must also be of type SparseIntMatrix2D, etc. In general, the new matrix should have internal parametrization as similar as possible.

Overrides:

like in class WrapperIntMatrix2D

Parameters:

rows - the number of rows the matrix shall have.

columns - the number of columns the matrix shall have.

Returns:

a new empty matrix of the same dynamic type.