Parallel Colt 0.7.2

cern.colt.matrix.tint.impl
Class WrapperIntMatrix2D

java.lang.Object
  extended by cern.colt.PersistentObject
      extended by cern.colt.matrix.AbstractMatrix
          extended by cern.colt.matrix.AbstractMatrix2D
              extended by cern.colt.matrix.tint.IntMatrix2D
                  extended by cern.colt.matrix.tint.impl.WrapperIntMatrix2D
All Implemented Interfaces:
Serializable, Cloneable
Direct Known Subclasses:
RCIntMatrix2D

public class WrapperIntMatrix2D
extends IntMatrix2D

2-d matrix holding int elements; either a view wrapping another matrix or a matrix whose views are wrappers.

Version:
1.0, 04/14/2000, 1.1, 08/22/2007
Author:
wolfgang.hoschek@cern.ch, Piotr Wendykier (piotr.wendykier@gmail.com)
See Also:
Serialized Form

Field Summary
 
Fields inherited from class cern.colt.PersistentObject
serialVersionUID
 
Constructor Summary
WrapperIntMatrix2D(IntMatrix2D newContent)
           
 
Method Summary
 Object 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.
 IntMatrix1D like1D(int size)
          Construct and returns a new 1-d matrix of the corresponding dynamic type, entirelly independent of the receiver.
 void setNcolumns(int columns)
          Sets the number of rows of this matrix
 void setNrows(int rows)
          Sets the number of rows of this matrix
 void setQuick(int row, int column, int value)
          Sets the matrix cell at coordinate [row,column] to the specified value.
 IntMatrix1D vectorize()
          Returns a vector obtained by stacking the columns of the matrix on top of one another.
 IntMatrix1D viewColumn(int column)
          Constructs and returns a new slice view representing the rows of the given column.
 IntMatrix2D viewColumnFlip()
          Constructs and returns a new flip view along the column axis.
 IntMatrix2D viewDice()
          Constructs and returns a new dice (transposition) view; Swaps axes; example: 3 x 4 matrix --> 4 x 3 matrix.
 IntMatrix2D viewPart(int row, int column, int height, int width)
          Constructs and returns a new sub-range view that is a height x width sub matrix starting at [row,column].
 IntMatrix1D viewRow(int row)
          Constructs and returns a new slice view representing the columns of the given row.
 IntMatrix2D viewRowFlip()
          Constructs and returns a new flip view along the row axis.
 IntMatrix2D viewSelection(int[] rowIndexes, int[] columnIndexes)
          Constructs and returns a new selection view that is a matrix holding the indicated cells.
 IntMatrix2D viewStrides(int _rowStride, int _columnStride)
          Constructs and returns a new stride view which is a sub matrix consisting of every i-th cell.
 
Methods inherited from class cern.colt.matrix.tint.IntMatrix2D
aggregate, aggregate, aggregate, aggregate, assign, assign, assign, assign, assign, assign, assign, assign, assign, cardinality, copy, equals, equals, 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, trimToSize
 
Methods inherited from class cern.colt.PersistentObject
clone
 
Methods inherited from class java.lang.Object
getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

WrapperIntMatrix2D

public WrapperIntMatrix2D(IntMatrix2D newContent)
Method Detail

elements

public Object elements()
Description copied from class: IntMatrix2D
Returns the elements of this matrix.

Specified by:
elements in class IntMatrix2D
Returns:
the elements

getQuick

public int getQuick(int row,
                    int column)
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().

Specified by:
getQuick in class IntMatrix2D
Parameters:
row - the index of the row-coordinate.
column - the index of the column-coordinate.
Returns:
the value at the specified coordinate.

like

public 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. 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.

Specified by:
like in class IntMatrix2D
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.

like1D

public IntMatrix1D like1D(int size)
Construct and returns a new 1-d matrix of the corresponding dynamic type, entirelly independent of the receiver. For example, if the receiver is an instance of type DenseIntMatrix2D the new matrix must be of type DenseIntMatrix1D, if the receiver is an instance of type SparseIntMatrix2D the new matrix must be of type SparseIntMatrix1D, etc.

Specified by:
like1D in class IntMatrix2D
Parameters:
size - the number of cells the matrix shall have.
Returns:
a new matrix of the corresponding dynamic type.

setQuick

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

Specified by:
setQuick in class IntMatrix2D
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.

vectorize

public IntMatrix1D vectorize()
Returns a vector obtained by stacking the columns of the matrix on top of one another.

Specified by:
vectorize in class IntMatrix2D
Returns:
a vector obtained by stacking the columns of the matrix on top of one another.

viewColumn

public IntMatrix1D viewColumn(int column)
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 IntMatrix2D
Parameters:
column - the column to fix.
Returns:
a new slice view.
Throws:
IndexOutOfBoundsException - if column < 0 || column >= columns().
See Also:
viewRow(int)

viewColumnFlip

public IntMatrix2D viewColumnFlip()
Constructs and returns a new flip view along the column axis. What used to be column 0 is now column columns()-1, ..., what used to be column columns()-1 is now column 0. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

Example:

2 x 3 matrix:
1, 2, 3
4, 5, 6
columnFlip ==> 2 x 3 matrix:
3, 2, 1
6, 5, 4
columnFlip ==> 2 x 3 matrix:
1, 2, 3
4, 5, 6

Overrides:
viewColumnFlip in class IntMatrix2D
Returns:
a new flip view.
See Also:
viewRowFlip()

viewDice

public IntMatrix2D viewDice()
Constructs and returns a new dice (transposition) view; Swaps axes; example: 3 x 4 matrix --> 4 x 3 matrix. The view has both dimensions exchanged; what used to be columns become rows, what used to be rows become columns. In other words: view.get(row,column)==this.get(column,row). This is a zero-copy transposition, taking O(1), i.e. constant time. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa. Use idioms like result = viewDice(A).copy() to generate an independent transposed matrix.

Example:

2 x 3 matrix:
1, 2, 3
4, 5, 6
transpose ==> 3 x 2 matrix:
1, 4
2, 5
3, 6
transpose ==> 2 x 3 matrix:
1, 2, 3
4, 5, 6

Overrides:
viewDice in class IntMatrix2D
Returns:
a new dice view.

setNcolumns

public void setNcolumns(int columns)
Sets the number of rows of this matrix

Parameters:
columns -

setNrows

public void setNrows(int rows)
Sets the number of rows of this matrix

Parameters:
rows -

viewPart

public IntMatrix2D viewPart(int row,
                            int column,
                            int height,
                            int width)
Constructs and returns a new sub-range view that is a height x width sub matrix starting at [row,column]. Operations on the returned view can only be applied to the restricted range. Any attempt to access coordinates not contained in the view will throw an IndexOutOfBoundsException.

Note that the view is really just a range restriction: The returned matrix is backed by this matrix, so changes in the returned matrix are reflected in this matrix, and vice-versa.

The view contains the cells from [row,column] to [row+height-1,column+width-1], all inclusive. and has view.rows() == height; view.columns() == width;. A view's legal coordinates are again zero based, as usual. In other words, legal coordinates of the view range from [0,0] to [view.rows()-1==height-1,view.columns()-1==width-1]. As usual, any attempt to access a cell at a coordinate column<0 || column>=view.columns() || row<0 || row>=view.rows() will throw an IndexOutOfBoundsException.

Overrides:
viewPart in class IntMatrix2D
Parameters:
row - The index of the row-coordinate.
column - The index of the column-coordinate.
height - The height of the box.
width - The width of the box.
Returns:
the new view.
Throws:
IndexOutOfBoundsException - if column<0 || width<0 || column+width>columns() || row<0 || height<0 || row+height>rows()

viewRow

public IntMatrix1D viewRow(int row)
Constructs and returns a new slice view representing the columns of the given row. 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
viewRow(0) ==> Matrix1D of size 3:
1, 2, 3

Overrides:
viewRow in class IntMatrix2D
Parameters:
row - the row to fix.
Returns:
a new slice view.
Throws:
IndexOutOfBoundsException - if row < 0 || row >= rows().
See Also:
viewColumn(int)

viewRowFlip

public IntMatrix2D viewRowFlip()
Constructs and returns a new flip view along the row axis. What used to be row 0 is now row rows()-1, ..., what used to be row rows()-1 is now row 0. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

Example:

2 x 3 matrix:
1, 2, 3
4, 5, 6
rowFlip ==> 2 x 3 matrix:
4, 5, 6
1, 2, 3
rowFlip ==> 2 x 3 matrix:
1, 2, 3
4, 5, 6

Overrides:
viewRowFlip in class IntMatrix2D
Returns:
a new flip view.
See Also:
viewColumnFlip()

viewSelection

public IntMatrix2D viewSelection(int[] rowIndexes,
                                 int[] columnIndexes)
Constructs and returns a new selection view that is a matrix holding the indicated cells. There holds view.rows() == rowIndexes.length, view.columns() == columnIndexes.length and view.get(i,j) == this.get(rowIndexes[i],columnIndexes[j]). Indexes can occur multiple times and can be in arbitrary order.

Example:

         this = 2 x 3 matrix:
         1, 2, 3
         4, 5, 6
         rowIndexes     = (0,1)
         columnIndexes  = (1,0,1,0)
         -->
         view = 2 x 4 matrix:
         2, 1, 2, 1
         5, 4, 5, 4
 
 
Note that modifying the index arguments after this call has returned has no effect on the view. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

To indicate "all" rows or "all columns", simply set the respective parameter

Overrides:
viewSelection in class IntMatrix2D
Parameters:
rowIndexes - The rows of the cells that shall be visible in the new view. To indicate that all rows shall be visible, simply set this parameter to null.
columnIndexes - The columns of the cells that shall be visible in the new view. To indicate that all columns shall be visible, simply set this parameter to null.
Returns:
the new view.
Throws:
IndexOutOfBoundsException - if !(0 <= rowIndexes[i] < rows()) for any i=0..rowIndexes.length()-1.
IndexOutOfBoundsException - if !(0 <= columnIndexes[i] < columns()) for any i=0..columnIndexes.length()-1.

viewStrides

public IntMatrix2D viewStrides(int _rowStride,
                               int _columnStride)
Constructs and returns a new stride view which is a sub matrix consisting of every i-th cell. More specifically, the view has this.rows()/rowStride rows and this.columns()/columnStride columns holding cells this.get(i*rowStride,j*columnStride) for all i = 0..rows()/rowStride - 1, j = 0..columns()/columnStride - 1. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

Overrides:
viewStrides in class IntMatrix2D
Parameters:
_rowStride - the row step factor.
_columnStride - the column step factor.
Returns:
a new view.
Throws:
IndexOutOfBoundsException - if rowStride<=0 || columnStride<=0.

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