cern.colt.matrix.tdouble.impl

Class WrapperDoubleMatrix3D

java.lang.Object

cern.colt.PersistentObject

cern.colt.matrix.AbstractMatrix

cern.colt.matrix.AbstractMatrix3D

cern.colt.matrix.tdouble.DoubleMatrix3D

cern.colt.matrix.tdouble.impl.WrapperDoubleMatrix3D

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

DenseLargeDoubleMatrix3D

public class WrapperDoubleMatrix3D
extends DoubleMatrix3D

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

Author:

Piotr Wendykier (piotr.wendykier@gmail.com)

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
WrapperDoubleMatrix3D(DoubleMatrix3D newContent)

Method Summary

Methods

Modifier and Type	Method and Description
void	dct2Slices(boolean scale) Computes the 2D discrete cosine transform (DCT-II) of each slice of this matrix.
void	dct3(boolean scale) Computes the 3D discrete cosine transform (DCT-II) of this matrix.
void	dht2Slices() Computes the 2D discrete Hertley transform (DHT) of each column of this matrix.
void	dht3() Computes the 3D discrete Hartley transform (DHT) of this matrix.
void	dst2Slices(boolean scale) Computes the 2D discrete sine transform (DST-II) of each slice of this matrix.
void	dst3(boolean scale) Computes the 3D discrete sine transform (DST-II) of this matrix.
Object	elements() Returns the elements of this matrix.
void	fft3() Computes the 3D discrete Fourier transform (DFT) of this matrix.
DenseLargeDComplexMatrix3D	getFft2Slices() Returns new complex matrix which is the 2D discrete Fourier transform (DFT) of each slice of this matrix.
DenseLargeDComplexMatrix3D	getFft3() Returns new complex matrix which is the 3D discrete Fourier transform (DFT) of this matrix.
DenseLargeDComplexMatrix3D	getIfft2Slices(boolean scale) Returns new complex matrix which is the 2D inverse of the discrete Fourier transform (IDFT) of each slice of this matrix.
DenseLargeDComplexMatrix3D	getIfft3(boolean scale) Returns new complex matrix which is the 3D inverse of the discrete Fourier transform (IDFT) of this matrix.
double	getQuick(int slice, int row, int column) Returns the matrix cell value at coordinate [slice,row,column].
void	idct2Slices(boolean scale) Computes the 2D inverse of the discrete cosine transform (DCT-III) of each slice of this matrix.
void	idct3(boolean scale) Computes the 3D inverse of the discrete cosine transform (DCT-III) of this matrix.
void	idht2Slices(boolean scale) Computes the 2D inverse of the discrete Hartley transform (DHT) of each slice of this matrix.
void	idht3(boolean scale) Computes the 3D inverse of the discrete Hartley transform (DHT) of this matrix.
void	idst2Slices(boolean scale) Computes the 2D inverse of the discrete sine transform (DST-III) of each slice of this matrix.
void	idst3(boolean scale) Computes the 3D inverse of the discrete size transform (DST-III) of this matrix.
void	ifft3(boolean scale) Computes the 3D inverse of the discrete Fourier transform (IDFT) of this matrix.
DoubleMatrix3D	like(int slices, int rows, int columns) Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of slices, rows and columns.
DoubleMatrix2D	like2D(int rows, int columns) Construct and returns a new 2-d matrix of the corresponding dynamic type, sharing the same cells.
void	setQuick(int slice, int row, int column, double value) Sets the matrix cell at coordinate [slice,row,column] to the specified value.
DoubleMatrix1D	vectorize() Returns a vector obtained by stacking the columns of each slice of the matrix on top of one another.
DoubleMatrix2D	viewColumn(int column) Constructs and returns a new 2-dimensional slice view representing the slices and rows of the given column.
DoubleMatrix3D	viewColumnFlip() Constructs and returns a new flip view along the column axis.
DoubleMatrix3D	viewDice(int axis0, int axis1, int axis2) Constructs and returns a new dice view; Swaps dimensions (axes); Example: 3 x 4 x 5 matrix --> 4 x 3 x 5 matrix.
DoubleMatrix3D	viewPart(int slice, int row, int column, int depth, int height, int width) Constructs and returns a new sub-range view that is a depth x height x width sub matrix starting at [slice,row,column]; Equivalent to view().part(slice,row,column,depth,height,width); Provided for convenience only.
DoubleMatrix2D	viewRow(int row) Constructs and returns a new 2-dimensional slice view representing the slices and columns of the given row.
DoubleMatrix3D	viewRowFlip() Constructs and returns a new flip view along the row axis.
DoubleMatrix3D	viewSelection(int[] sliceIndexes, int[] rowIndexes, int[] columnIndexes) Constructs and returns a new selection view that is a matrix holding the indicated cells.
DoubleMatrix2D	viewSlice(int slice) Constructs and returns a new 2-dimensional slice view representing the rows and columns of the given slice.
DoubleMatrix3D	viewSliceFlip() Constructs and returns a new flip view along the slice axis.
DoubleMatrix3D	viewStrides(int _sliceStride, 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.tdouble.DoubleMatrix3D

aggregate, aggregate, aggregate, aggregate, assign, assign, assign, assign, assign, assign, assign, assign, assign, cardinality, copy, equals, equals, get, getMaxLocation, getMinLocation, getNegativeValues, getNonZeros, getPositiveValues, like, normalize, set, toArray, toString, viewSelection, viewSorted, zAssign27Neighbors, zSum

Methods inherited from class cern.colt.matrix.AbstractMatrix3D

checkShape, checkShape, columns, columnStride, index, rows, rowStride, size, slices, sliceStride, 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

WrapperDoubleMatrix3D

public WrapperDoubleMatrix3D(DoubleMatrix3D newContent)

Method Detail

elements

public Object elements()

Description copied from class: DoubleMatrix3D

Returns the elements of this matrix.

Specified by:

elements in class DoubleMatrix3D

Returns:

the elements

dct3

public void dct3(boolean scale)

Computes the 3D discrete cosine transform (DCT-II) of this matrix.

Parameters:

scale - if true then scaling is performed

dct2Slices

public void dct2Slices(boolean scale)

Computes the 2D discrete cosine transform (DCT-II) of each slice of this matrix.

Parameters:

scale - if true then scaling is performed

dst3

public void dst3(boolean scale)

Computes the 3D discrete sine transform (DST-II) of this matrix.

Parameters:

scale - if true then scaling is performed

dst2Slices

public void dst2Slices(boolean scale)

Computes the 2D discrete sine transform (DST-II) of each slice of this matrix.

Parameters:

scale - if true then scaling is performed

dht3

public void dht3()

Computes the 3D discrete Hartley transform (DHT) of this matrix.

dht2Slices

public void dht2Slices()

Computes the 2D discrete Hertley transform (DHT) of each column of this matrix.

fft3

public void fft3()

Computes the 3D discrete Fourier transform (DFT) of this matrix. The physical layout of the output data is as follows:

 this[k1][k2][2*k3] = Re[k1][k2][k3]
                 = Re[(n1-k1)%n1][(n2-k2)%n2][n3-k3], 
 this[k1][k2][2*k3+1] = Im[k1][k2][k3]
                   = -Im[(n1-k1)%n1][(n2-k2)%n2][n3-k3], 
     0<=k1<n1, 0<=k2<n2, 0<k3<n3/2, 
 this[k1][k2][0] = Re[k1][k2][0]
              = Re[(n1-k1)%n1][n2-k2][0], 
 this[k1][k2][1] = Im[k1][k2][0]
              = -Im[(n1-k1)%n1][n2-k2][0], 
 this[k1][n2-k2][1] = Re[(n1-k1)%n1][k2][n3/2]
                 = Re[k1][n2-k2][n3/2], 
 this[k1][n2-k2][0] = -Im[(n1-k1)%n1][k2][n3/2]
                 = Im[k1][n2-k2][n3/2], 
     0<=k1<n1, 0<k2<n2/2, 
 this[k1][0][0] = Re[k1][0][0]
             = Re[n1-k1][0][0], 
 this[k1][0][1] = Im[k1][0][0]
             = -Im[n1-k1][0][0], 
 this[k1][n2/2][0] = Re[k1][n2/2][0]
                = Re[n1-k1][n2/2][0], 
 this[k1][n2/2][1] = Im[k1][n2/2][0]
                = -Im[n1-k1][n2/2][0], 
 this[n1-k1][0][1] = Re[k1][0][n3/2]
                = Re[n1-k1][0][n3/2], 
 this[n1-k1][0][0] = -Im[k1][0][n3/2]
                = Im[n1-k1][0][n3/2], 
 this[n1-k1][n2/2][1] = Re[k1][n2/2][n3/2]
                   = Re[n1-k1][n2/2][n3/2], 
 this[n1-k1][n2/2][0] = -Im[k1][n2/2][n3/2]
                   = Im[n1-k1][n2/2][n3/2], 
     0<k1<n1/2, 
 this[0][0][0] = Re[0][0][0], 
 this[0][0][1] = Re[0][0][n3/2], 
 this[0][n2/2][0] = Re[0][n2/2][0], 
 this[0][n2/2][1] = Re[0][n2/2][n3/2], 
 this[n1/2][0][0] = Re[n1/2][0][0], 
 this[n1/2][0][1] = Re[n1/2][0][n3/2], 
 this[n1/2][n2/2][0] = Re[n1/2][n2/2][0], 
 this[n1/2][n2/2][1] = Re[n1/2][n2/2][n3/2]
 

This method computes only half of the elements of the real transform. The other half satisfies the symmetry condition. If you want the full real forward transform, use getFft3. To get back the original data, use ifft3.

Throws:

IllegalArgumentException - if the slice size or the row size or the column size of this matrix is not a power of 2 number.

getFft3

public DenseLargeDComplexMatrix3D getFft3()

Returns new complex matrix which is the 3D discrete Fourier transform (DFT) of this matrix.

Returns:

the 3D discrete Fourier transform (DFT) of this matrix.

getIfft3

public DenseLargeDComplexMatrix3D getIfft3(boolean scale)

Returns new complex matrix which is the 3D inverse of the discrete Fourier transform (IDFT) of this matrix.

Returns:

the 3D inverse of the discrete Fourier transform (IDFT) of this matrix.

getFft2Slices

public DenseLargeDComplexMatrix3D getFft2Slices()

Returns new complex matrix which is the 2D discrete Fourier transform (DFT) of each slice of this matrix.

Returns:

the 2D discrete Fourier transform (DFT) of each slice of this matrix.

getIfft2Slices

public DenseLargeDComplexMatrix3D getIfft2Slices(boolean scale)

Returns new complex matrix which is the 2D inverse of the discrete Fourier transform (IDFT) of each slice of this matrix.

Returns:

the 2D inverse of the discrete Fourier transform (IDFT) of each slice of this matrix.

idct3

public void idct3(boolean scale)

Computes the 3D inverse of the discrete cosine transform (DCT-III) of this matrix.

Parameters:

scale - if true then scaling is performed

idct2Slices

public void idct2Slices(boolean scale)

Computes the 2D inverse of the discrete cosine transform (DCT-III) of each slice of this matrix.

Parameters:

scale - if true then scaling is performed

idst3

public void idst3(boolean scale)

Computes the 3D inverse of the discrete size transform (DST-III) of this matrix.

Parameters:

scale - if true then scaling is performed

idst2Slices

public void idst2Slices(boolean scale)

Computes the 2D inverse of the discrete sine transform (DST-III) of each slice of this matrix.

Parameters:

scale - if true then scaling is performed

idht3

public void idht3(boolean scale)

Computes the 3D inverse of the discrete Hartley transform (DHT) of this matrix.

Parameters:

scale - if true then scaling is performed

idht2Slices

public void idht2Slices(boolean scale)

Computes the 2D inverse of the discrete Hartley transform (DHT) of each slice of this matrix.

Parameters:

scale - if true then scaling is performed

ifft3

public void ifft3(boolean scale)

Computes the 3D inverse of the discrete Fourier transform (IDFT) of this matrix. The physical layout of the input data has to be as follows:

 this[k1][k2][2*k3] = Re[k1][k2][k3]
                 = Re[(n1-k1)%n1][(n2-k2)%n2][n3-k3], 
 this[k1][k2][2*k3+1] = Im[k1][k2][k3]
                   = -Im[(n1-k1)%n1][(n2-k2)%n2][n3-k3], 
     0<=k1<n1, 0<=k2<n2, 0<k3<n3/2, 
 this[k1][k2][0] = Re[k1][k2][0]
              = Re[(n1-k1)%n1][n2-k2][0], 
 this[k1][k2][1] = Im[k1][k2][0]
              = -Im[(n1-k1)%n1][n2-k2][0], 
 this[k1][n2-k2][1] = Re[(n1-k1)%n1][k2][n3/2]
                 = Re[k1][n2-k2][n3/2], 
 this[k1][n2-k2][0] = -Im[(n1-k1)%n1][k2][n3/2]
                 = Im[k1][n2-k2][n3/2], 
     0<=k1<n1, 0<k2<n2/2, 
 this[k1][0][0] = Re[k1][0][0]
             = Re[n1-k1][0][0], 
 this[k1][0][1] = Im[k1][0][0]
             = -Im[n1-k1][0][0], 
 this[k1][n2/2][0] = Re[k1][n2/2][0]
                = Re[n1-k1][n2/2][0], 
 this[k1][n2/2][1] = Im[k1][n2/2][0]
                = -Im[n1-k1][n2/2][0], 
 this[n1-k1][0][1] = Re[k1][0][n3/2]
                = Re[n1-k1][0][n3/2], 
 this[n1-k1][0][0] = -Im[k1][0][n3/2]
                = Im[n1-k1][0][n3/2], 
 this[n1-k1][n2/2][1] = Re[k1][n2/2][n3/2]
                   = Re[n1-k1][n2/2][n3/2], 
 this[n1-k1][n2/2][0] = -Im[k1][n2/2][n3/2]
                   = Im[n1-k1][n2/2][n3/2], 
     0<k1<n1/2, 
 this[0][0][0] = Re[0][0][0], 
 this[0][0][1] = Re[0][0][n3/2], 
 this[0][n2/2][0] = Re[0][n2/2][0], 
 this[0][n2/2][1] = Re[0][n2/2][n3/2], 
 this[n1/2][0][0] = Re[n1/2][0][0], 
 this[n1/2][0][1] = Re[n1/2][0][n3/2], 
 this[n1/2][n2/2][0] = Re[n1/2][n2/2][0], 
 this[n1/2][n2/2][1] = Re[n1/2][n2/2][n3/2]
 

This method computes only half of the elements of the real transform. The other half satisfies the symmetry condition. If you want the full real inverse transform, use getIfft3.

Parameters:

scale - if true then scaling is performed

Throws:

IllegalArgumentException - if the slice size or the row size or the column size of this matrix is not a power of 2 number.

getQuick

public double getQuick(int slice,
              int row,
              int column)

Description copied from class: DoubleMatrix3D

Returns the matrix cell value at coordinate [slice,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): slice<0 || slice>=slices() || row<0 || row>=rows() || column<0 || column>=column().

Specified by:

getQuick in class DoubleMatrix3D

Parameters:

slice - the index of the slice-coordinate.

row - the index of the row-coordinate.

column - the index of the column-coordinate.

Returns:

the value at the specified coordinate.

like

public DoubleMatrix3D like(int slices,
                  int rows,
                  int columns)

Description copied from class: DoubleMatrix3D

Construct and returns a new empty matrix of the same dynamic type as the receiver, having the specified number of slices, rows and columns. For example, if the receiver is an instance of type DenseDoubleMatrix3D the new matrix must also be of type DenseDoubleMatrix3D, if the receiver is an instance of type SparseDoubleMatrix3D the new matrix must also be of type SparseDoubleMatrix3D, etc. In general, the new matrix should have internal parametrization as similar as possible.

Specified by:

like in class DoubleMatrix3D

Parameters:

slices - the number of slices the matrix shall have.

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.

setQuick

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

Description copied from class: DoubleMatrix3D

Sets the matrix cell at coordinate [slice,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): slice<0 || slice>=slices() || row<0 || row>=rows() || column<0 || column>=column().

Specified by:

setQuick in class DoubleMatrix3D

Parameters:

slice - the index of the slice-coordinate.

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 DoubleMatrix1D vectorize()

Description copied from class: DoubleMatrix3D

Returns a vector obtained by stacking the columns of each slice of the matrix on top of one another.

Specified by:

vectorize in class DoubleMatrix3D

Returns:

a vector obtained by stacking the columns of each slice of the matrix on top of one another.

viewColumn

public DoubleMatrix2D viewColumn(int column)

Description copied from class: DoubleMatrix3D

Constructs and returns a new 2-dimensional slice view representing the slices and 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 ( view().part(...)), then apply this method to the sub-range view. To obtain 1-dimensional views, apply this method, then apply another slice view (methods viewColumn, viewRow) on the intermediate 2-dimensional view. To obtain 1-dimensional views on subranges, apply both steps.

Overrides:

viewColumn in class DoubleMatrix3D

Parameters:

column - the index of the column to fix.

Returns:

a new 2-dimensional slice view.

See Also:

DoubleMatrix3D.viewSlice(int), DoubleMatrix3D.viewRow(int)

viewColumnFlip

public DoubleMatrix3D viewColumnFlip()

Description copied from class: DoubleMatrix3D

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.

Overrides:

viewColumnFlip in class DoubleMatrix3D

Returns:

a new flip view.

See Also:

DoubleMatrix3D.viewSliceFlip(), DoubleMatrix3D.viewRowFlip()

viewSlice

public DoubleMatrix2D viewSlice(int slice)

Description copied from class: DoubleMatrix3D

Constructs and returns a new 2-dimensional slice view representing the rows and columns of the given slice. 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 ( view().part(...)), then apply this method to the sub-range view. To obtain 1-dimensional views, apply this method, then apply another slice view (methods viewColumn, viewRow) on the intermediate 2-dimensional view. To obtain 1-dimensional views on subranges, apply both steps.

Overrides:

viewSlice in class DoubleMatrix3D

Parameters:

slice - the index of the slice to fix.

Returns:

a new 2-dimensional slice view.

See Also:

DoubleMatrix3D.viewRow(int), DoubleMatrix3D.viewColumn(int)

viewSliceFlip

public DoubleMatrix3D viewSliceFlip()

Description copied from class: DoubleMatrix3D

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

Overrides:

viewSliceFlip in class DoubleMatrix3D

Returns:

a new flip view.

See Also:

DoubleMatrix3D.viewRowFlip(), DoubleMatrix3D.viewColumnFlip()

viewDice

public DoubleMatrix3D viewDice(int axis0,
                      int axis1,
                      int axis2)

Description copied from class: DoubleMatrix3D

Constructs and returns a new dice view; Swaps dimensions (axes); Example: 3 x 4 x 5 matrix --> 4 x 3 x 5 matrix. The view has dimensions exchanged; what used to be one axis is now another, in all desired permutations. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

Overrides:

viewDice in class DoubleMatrix3D

Parameters:

axis0 - the axis that shall become axis 0 (legal values 0..2).

axis1 - the axis that shall become axis 1 (legal values 0..2).

axis2 - the axis that shall become axis 2 (legal values 0..2).

Returns:

a new dice view.

viewPart

public DoubleMatrix3D viewPart(int slice,
                      int row,
                      int column,
                      int depth,
                      int height,
                      int width)

Description copied from class: DoubleMatrix3D

Constructs and returns a new sub-range view that is a depth x height x width sub matrix starting at [slice,row,column]; Equivalent to view().part(slice,row,column,depth,height,width); Provided for convenience only. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

Overrides:

viewPart in class DoubleMatrix3D

Parameters:

slice - The index of the slice-coordinate.

row - The index of the row-coordinate.

column - The index of the column-coordinate.

depth - The depth of the box.

height - The height of the box.

width - The width of the box.

Returns:

the new view.

viewRow

public DoubleMatrix2D viewRow(int row)

Description copied from class: DoubleMatrix3D

Constructs and returns a new 2-dimensional slice view representing the slices and 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 ( view().part(...)), then apply this method to the sub-range view. To obtain 1-dimensional views, apply this method, then apply another slice view (methods viewColumn, viewRow) on the intermediate 2-dimensional view. To obtain 1-dimensional views on subranges, apply both steps.

Overrides:

viewRow in class DoubleMatrix3D

Parameters:

row - the index of the row to fix.

Returns:

a new 2-dimensional slice view.

See Also:

DoubleMatrix3D.viewSlice(int), DoubleMatrix3D.viewColumn(int)

viewRowFlip

public DoubleMatrix3D viewRowFlip()

Description copied from class: DoubleMatrix3D

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.

Overrides:

viewRowFlip in class DoubleMatrix3D

Returns:

a new flip view.

See Also:

DoubleMatrix3D.viewSliceFlip(), DoubleMatrix3D.viewColumnFlip()

viewSelection

public DoubleMatrix3D viewSelection(int[] sliceIndexes,
                           int[] rowIndexes,
                           int[] columnIndexes)

Description copied from class: DoubleMatrix3D

Constructs and returns a new selection view that is a matrix holding the indicated cells. There holds view.slices() == sliceIndexes.length, view.rows() == rowIndexes.length, view.columns() == columnIndexes.length and view.get(k,i,j) == this.get(sliceIndexes[k],rowIndexes[i],columnIndexes[j]) . Indexes can occur multiple times and can be in arbitrary order. For an example see DoubleMatrix2D.viewSelection(int[],int[]).

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.

Overrides:

viewSelection in class DoubleMatrix3D

Parameters:

sliceIndexes - The slices of the cells that shall be visible in the new view. To indicate that all slices shall be visible, simply set this parameter to null.

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.

viewStrides

public DoubleMatrix3D viewStrides(int _sliceStride,
                         int _rowStride,
                         int _columnStride)

Description copied from class: DoubleMatrix3D

Constructs and returns a new stride view which is a sub matrix consisting of every i-th cell. More specifically, the view has this.slices()/sliceStride slices and this.rows()/rowStride rows and this.columns()/columnStride columns holding cells this.get(k*sliceStride,i*rowStride,j*columnStride) for all k = 0..slices()/sliceStride - 1, 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 DoubleMatrix3D

Parameters:

_sliceStride - the slice step factor.

_rowStride - the row step factor.

_columnStride - the column step factor.

Returns:

a new view.

like2D

public DoubleMatrix2D like2D(int rows,
                    int columns)

Description copied from class: DoubleMatrix3D

Construct and returns a new 2-d matrix of the corresponding dynamic type, sharing the same cells. For example, if the receiver is an instance of type DenseDoubleMatrix3D the new matrix must also be of type DenseDoubleMatrix2D, if the receiver is an instance of type SparseDoubleMatrix3D the new matrix must also be of type SparseDoubleMatrix2D, etc.

Specified by:

like2D in class DoubleMatrix3D

Parameters:

rows - the number of rows the matrix shall have.

columns - the number of columns the matrix shall have.

Returns:

a new matrix of the corresponding dynamic type.