cern.colt.matrix
Class DoubleMatrix3D

java.lang.Object
  extended by cern.colt.PersistentObject
      extended by cern.colt.matrix.impl.AbstractMatrix
          extended by cern.colt.matrix.impl.AbstractMatrix3D
              extended by cern.colt.matrix.DoubleMatrix3D
All Implemented Interfaces:
java.io.Serializable, java.lang.Cloneable
Direct Known Subclasses:
DenseDoubleMatrix3D, SparseDoubleMatrix3D

public abstract class DoubleMatrix3D
extends AbstractMatrix3D

Abstract base class for 3-d matrices holding double elements. First see the package summary and javadoc tree view to get the broad picture.

A matrix has a number of slices, rows and columns, which are assigned upon instance construction - The matrix's size is then slices()*rows()*columns(). Elements are accessed via [slice,row,column] coordinates. Legal coordinates range from [0,0,0] to [slices()-1,rows()-1,columns()-1]. Any attempt to access an element at a coordinate slice<0 || slice>=slices() || row<0 || row>=rows() || column<0 || column>=column() will throw an IndexOutOfBoundsException.

Note that this implementation is not synchronized.

Author:
wolfgang.hoschek@cern.ch
See Also:
Serialized Form

Field Summary
 
Fields inherited from class cern.colt.matrix.impl.AbstractMatrix3D
columns, columnStride, columnZero, rows, rowStride, rowZero, slices, sliceStride, sliceZero
 
Fields inherited from class cern.colt.matrix.impl.AbstractMatrix
isNoView
 
Fields inherited from class cern.colt.PersistentObject
serialVersionUID
 
Constructor Summary
protected DoubleMatrix3D()
          Makes this class non instantiable, but still let's others inherit from it.
 
Method Summary
 double aggregate(DoubleDoubleFunction aggr, DoubleFunction f)
          Applies a function to each cell and aggregates the results.
 double aggregate(DoubleMatrix3D other, DoubleDoubleFunction aggr, DoubleDoubleFunction f)
          Applies a function to each corresponding cell of two matrices and aggregates the results.
 DoubleMatrix3D assign(double value)
          Sets all cells to the state specified by value.
 DoubleMatrix3D assign(double[][][] values)
          Sets all cells to the state specified by values.
 DoubleMatrix3D assign(DoubleFunction function)
          Assigns the result of a function to each cell; x[slice,row,col] = function(x[slice,row,col]).
 DoubleMatrix3D assign(DoubleMatrix3D other)
          Replaces all cell values of the receiver with the values of another matrix.
 DoubleMatrix3D assign(DoubleMatrix3D y, DoubleDoubleFunction function)
          Assigns the result of a function to each cell; x[row,col] = function(x[row,col],y[row,col]).
 int cardinality()
          Returns the number of cells having non-zero values; ignores tolerance.
 DoubleMatrix3D copy()
          Constructs and returns a deep copy of the receiver.
 boolean equals(double value)
          Returns whether all cells are equal to the given value.
 boolean equals(java.lang.Object obj)
          Compares this object against the specified object.
 double get(int slice, int row, int column)
          Returns the matrix cell value at coordinate [slice,row,column].
protected  DoubleMatrix3D getContent()
          Returns the content of this matrix if it is a wrapper; or this otherwise.
 void getNonZeros(IntArrayList sliceList, IntArrayList rowList, IntArrayList columnList, DoubleArrayList valueList)
          Fills the coordinates and values of cells having non-zero values into the specified lists.
abstract  double getQuick(int slice, int row, int column)
          Returns the matrix cell value at coordinate [slice,row,column].
protected  boolean haveSharedCells(DoubleMatrix3D other)
          Returns true if both matrices share at least one identical cell.
protected  boolean haveSharedCellsRaw(DoubleMatrix3D other)
          Returns true if both matrices share at least one identical cell.
 DoubleMatrix3D like()
          Construct and returns a new empty matrix of the same dynamic type as the receiver, having the same number of slices, rows and columns.
abstract  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.
protected abstract  DoubleMatrix2D like2D(int rows, int columns, int rowZero, int columnZero, int rowStride, int columnStride)
          Construct and returns a new 2-d matrix of the corresponding dynamic type, sharing the same cells.
 void set(int slice, int row, int column, double value)
          Sets the matrix cell at coordinate [slice,row,column] to the specified value.
abstract  void setQuick(int slice, int row, int column, double value)
          Sets the matrix cell at coordinate [slice,row,column] to the specified value.
 double[][][] toArray()
          Constructs and returns a 2-dimensional array containing the cell values.
 java.lang.String toString()
          Returns a string representation using default formatting.
protected  DoubleMatrix3D view()
          Constructs and returns a new view equal to the receiver.
 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(DoubleMatrix2DProcedure condition)
          Constructs and returns a new selection view that is a matrix holding all slices matching the given condition.
 DoubleMatrix3D viewSelection(int[] sliceIndexes, int[] rowIndexes, int[] columnIndexes)
          Constructs and returns a new selection view that is a matrix holding the indicated cells.
protected abstract  DoubleMatrix3D viewSelectionLike(int[] sliceOffsets, int[] rowOffsets, int[] columnOffsets)
          Construct and returns a new selection view.
 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 viewSorted(int row, int column)
          Sorts the matrix slices into ascending order, according to the natural ordering of the matrix values in the given [row,column] position.
 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.
 void zAssign27Neighbors(DoubleMatrix3D B, Double27Function function)
          27 neighbor stencil transformation.
 double zSum()
          Returns the sum of all cells; Sum( x[i,j,k] ).
 
Methods inherited from class cern.colt.matrix.impl.AbstractMatrix3D
_columnOffset, _columnRank, _rowOffset, _rowRank, _sliceOffset, _sliceRank, checkBox, checkColumn, checkColumnIndexes, checkRow, checkRowIndexes, checkShape, checkShape, checkSlice, checkSliceIndexes, columns, index, rows, setUp, setUp, shape, size, slices, toStringShort, vColumnFlip, vDice, vPart, vRowFlip, vSliceFlip, vStrides
 
Methods inherited from class cern.colt.matrix.impl.AbstractMatrix
ensureCapacity, isView, trimToSize
 
Methods inherited from class cern.colt.PersistentObject
clone
 
Methods inherited from class java.lang.Object
finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

DoubleMatrix3D

protected DoubleMatrix3D()
Makes this class non instantiable, but still let's others inherit from it.

Method Detail

aggregate

public double aggregate(DoubleDoubleFunction aggr,
                        DoubleFunction f)
Applies a function to each cell and aggregates the results. Returns a value v such that v==a(size()) where a(i) == aggr( a(i-1), f(get(slice,row,column)) ) and terminators are a(1) == f(get(0,0,0)), a(0)==Double.NaN.

Example:

cern.jet.math.Functions F = cern.jet.math.Functions.functions;
2 x 2 x 2 matrix
0 1
2 3

4 5
6 7

// Sum( x[slice,row,col]*x[slice,row,col] ) 
matrix.aggregate(F.plus,F.square);
--> 140
For further examples, see the package doc.

Parameters:
aggr - an aggregation function taking as first argument the current aggregation and as second argument the transformed current cell value.
f - a function transforming the current cell value.
Returns:
the aggregated measure.
See Also:
Functions

aggregate

public double aggregate(DoubleMatrix3D other,
                        DoubleDoubleFunction aggr,
                        DoubleDoubleFunction f)
Applies a function to each corresponding cell of two matrices and aggregates the results. Returns a value v such that v==a(size()) where a(i) == aggr( a(i-1), f(get(slice,row,column),other.get(slice,row,column)) ) and terminators are a(1) == f(get(0,0,0),other.get(0,0,0)), a(0)==Double.NaN.

Example:

cern.jet.math.Functions F = cern.jet.math.Functions.functions;
x = 2 x 2 x 2 matrix
0 1
2 3

4 5
6 7

y = 2 x 2 x 2 matrix
0 1
2 3

4 5
6 7

// Sum( x[slice,row,col] * y[slice,row,col] ) 
x.aggregate(y, F.plus, F.mult);
--> 140

// Sum( (x[slice,row,col] + y[slice,row,col])^2 )
x.aggregate(y, F.plus, F.chain(F.square,F.plus));
--> 560
For further examples, see the package doc.

Parameters:
aggr - an aggregation function taking as first argument the current aggregation and as second argument the transformed current cell values.
f - a function transforming the current cell values.
Returns:
the aggregated measure.
Throws:
java.lang.IllegalArgumentException - if slices() != other.slices() || rows() != other.rows() || columns() != other.columns()
See Also:
Functions

assign

public DoubleMatrix3D assign(double[][][] values)
Sets all cells to the state specified by values. values is required to have the form values[slice][row][column] and have exactly the same number of slices, rows and columns as the receiver.

The values are copied. So subsequent changes in values are not reflected in the matrix, and vice-versa.

Parameters:
values - the values to be filled into the cells.
Returns:
this (for convenience only).
Throws:
java.lang.IllegalArgumentException - if values.length != slices() || for any 0 <= slice < slices(): values[slice].length != rows().
java.lang.IllegalArgumentException - if for any 0 <= column < columns(): values[slice][row].length != columns().

assign

public DoubleMatrix3D assign(double value)
Sets all cells to the state specified by value.

Parameters:
value - the value to be filled into the cells.
Returns:
this (for convenience only).

assign

public DoubleMatrix3D assign(DoubleFunction function)
Assigns the result of a function to each cell; x[slice,row,col] = function(x[slice,row,col]).

Example:

matrix = 1 x 2 x 2 matrix
0.5 1.5      
2.5 3.5

// change each cell to its sine
matrix.assign(cern.jet.math.Functions.sin);
-->
1 x 2 x 2 matrix
0.479426  0.997495 
0.598472 -0.350783
For further examples, see the package doc.

Parameters:
function - a function object taking as argument the current cell's value.
Returns:
this (for convenience only).
See Also:
Functions

assign

public DoubleMatrix3D assign(DoubleMatrix3D other)
Replaces all cell values of the receiver with the values of another matrix. Both matrices must have the same number of slices, rows and columns. If both matrices share the same cells (as is the case if they are views derived from the same matrix) and intersect in an ambiguous way, then replaces as if using an intermediate auxiliary deep copy of other.

Parameters:
other - the source matrix to copy from (may be identical to the receiver).
Returns:
this (for convenience only).
Throws:
java.lang.IllegalArgumentException - if slices() != other.slices() || rows() != other.rows() || columns() != other.columns()

assign

public DoubleMatrix3D assign(DoubleMatrix3D y,
                             DoubleDoubleFunction function)
Assigns the result of a function to each cell; x[row,col] = function(x[row,col],y[row,col]).

Example:

// assign x[row,col] = x[row,col]y[row,col]
m1 = 1 x 2 x 2 matrix 
0 1 
2 3

m2 = 1 x 2 x 2 matrix 
0 2 
4 6

m1.assign(m2, cern.jet.math.Functions.pow);
-->
m1 == 1 x 2 x 2 matrix
 1   1 
16 729
For further examples, see the package doc.

Parameters:
y - the secondary matrix to operate on.
function - a function object taking as first argument the current cell's value of this, and as second argument the current cell's value of y,
Returns:
this (for convenience only).
Throws:
java.lang.IllegalArgumentException - if slices() != other.slices() || rows() != other.rows() || columns() != other.columns()
See Also:
Functions

cardinality

public int cardinality()
Returns the number of cells having non-zero values; ignores tolerance.


copy

public DoubleMatrix3D copy()
Constructs and returns a deep copy of the receiver.

Note that the returned matrix is an independent deep copy. The returned matrix is not backed by this matrix, so changes in the returned matrix are not reflected in this matrix, and vice-versa.

Returns:
a deep copy of the receiver.

equals

public boolean equals(double value)
Returns whether all cells are equal to the given value.

Parameters:
value - the value to test against.
Returns:
true if all cells are equal to the given value, false otherwise.

equals

public boolean equals(java.lang.Object obj)
Compares this object against the specified object. The result is true if and only if the argument is not null and is at least a DoubleMatrix3D object that has the same number of slices, rows and columns as the receiver and has exactly the same values at the same coordinates.

Overrides:
equals in class java.lang.Object
Parameters:
obj - the object to compare with.
Returns:
true if the objects are the same; false otherwise.

get

public double get(int slice,
                  int row,
                  int column)
Returns the matrix cell value at coordinate [slice,row,column].

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 of the specified cell.
Throws:
java.lang.IndexOutOfBoundsException - if slice<0 || slice>=slices() || row<0 || row>=rows() || column<0 || column>=column().

getContent

protected DoubleMatrix3D getContent()
Returns the content of this matrix if it is a wrapper; or this otherwise. Override this method in wrappers.


getNonZeros

public void getNonZeros(IntArrayList sliceList,
                        IntArrayList rowList,
                        IntArrayList columnList,
                        DoubleArrayList valueList)
Fills the coordinates and values of cells having non-zero values into the specified lists. Fills into the lists, starting at index 0. After this call returns the specified lists all have a new size, the number of non-zero values.

In general, fill order is unspecified. This implementation fill like: for (slice = 0..slices-1) for (row = 0..rows-1) for (column = 0..colums-1) do ... . However, subclasses are free to us any other order, even an order that may change over time as cell values are changed. (Of course, result lists indexes are guaranteed to correspond to the same cell). For an example, see DoubleMatrix2D.getNonZeros(IntArrayList,IntArrayList,DoubleArrayList).

Parameters:
sliceList - the list to be filled with slice indexes, can have any size.
rowList - the list to be filled with row indexes, can have any size.
columnList - the list to be filled with column indexes, can have any size.
valueList - the list to be filled with values, can have any size.

getQuick

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

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.

haveSharedCells

protected boolean haveSharedCells(DoubleMatrix3D other)
Returns true if both matrices share at least one identical cell.


haveSharedCellsRaw

protected boolean haveSharedCellsRaw(DoubleMatrix3D other)
Returns true if both matrices share at least one identical cell.


like

public DoubleMatrix3D like()
Construct and returns a new empty matrix of the same dynamic type as the receiver, having the same 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.

Returns:
a new empty matrix of the same dynamic type.

like

public abstract 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. 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.

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.

like2D

protected abstract DoubleMatrix2D like2D(int rows,
                                         int columns,
                                         int rowZero,
                                         int columnZero,
                                         int rowStride,
                                         int columnStride)
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.

Parameters:
rows - the number of rows the matrix shall have.
columns - the number of columns the matrix shall have.
rowZero - the position of the first element.
columnZero - the position of the first element.
rowStride - the number of elements between two rows, i.e. index(i+1,j)-index(i,j).
columnStride - the number of elements between two columns, i.e. index(i,j+1)-index(i,j).
Returns:
a new matrix of the corresponding dynamic type.

set

public void set(int slice,
                int row,
                int column,
                double value)
Sets the matrix cell at coordinate [slice,row,column] to the specified value.

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.
Throws:
java.lang.IndexOutOfBoundsException - if row<0 || row>=rows() || slice<0 || slice>=slices() || column<0 || column>=column().

setQuick

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

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.

toArray

public double[][][] toArray()
Constructs and returns a 2-dimensional array containing the cell values. The returned array values has the form values[slice][row][column] and has the same number of slices, rows and columns as the receiver.

The values are copied. So subsequent changes in values are not reflected in the matrix, and vice-versa.

Returns:
an array filled with the values of the cells.

toString

public java.lang.String toString()
Returns a string representation using default formatting.

Overrides:
toString in class java.lang.Object
See Also:
Formatter

view

protected DoubleMatrix3D view()
Constructs and returns a new view equal to the receiver. The view is a shallow clone. Calls clone() and casts the result.

Note that the view is not a deep copy. The returned matrix is backed by this matrix, so changes in the returned matrix are reflected in this matrix, and vice-versa.

Use copy() if you want to construct an independent deep copy rather than a new view.

Returns:
a new view of the receiver.

viewColumn

public DoubleMatrix2D viewColumn(int column)
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.

Parameters:
column - the index of the column to fix.
Returns:
a new 2-dimensional slice view.
Throws:
java.lang.IndexOutOfBoundsException - if column < 0 || column >= columns().
See Also:
viewSlice(int), viewRow(int)

viewColumnFlip

public DoubleMatrix3D 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.

Returns:
a new flip view.
See Also:
viewSliceFlip(), viewRowFlip()

viewDice

public 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. 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.

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.
Throws:
java.lang.IllegalArgumentException - if some of the parameters are equal or not in range 0..2.

viewPart

public 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. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

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.
Throws:
java.lang.IndexOutOfBoundsException - if slice<0 || depth<0 || slice+depth>slices() || row<0 || height<0 || row+height>rows() || column<0 || width<0 || column+width>columns()

viewRow

public DoubleMatrix2D viewRow(int row)
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.

Parameters:
row - the index of the row to fix.
Returns:
a new 2-dimensional slice view.
Throws:
java.lang.IndexOutOfBoundsException - if row < 0 || row >= row().
See Also:
viewSlice(int), viewColumn(int)

viewRowFlip

public DoubleMatrix3D 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.

Returns:
a new flip view.
See Also:
viewSliceFlip(), viewColumnFlip()

viewSelection

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

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.
Throws:
java.lang.IndexOutOfBoundsException - if !(0 <= sliceIndexes[i] < slices()) for any i=0..sliceIndexes.length()-1.
java.lang.IndexOutOfBoundsException - if !(0 <= rowIndexes[i] < rows()) for any i=0..rowIndexes.length()-1.
java.lang.IndexOutOfBoundsException - if !(0 <= columnIndexes[i] < columns()) for any i=0..columnIndexes.length()-1.

viewSelection

public DoubleMatrix3D viewSelection(DoubleMatrix2DProcedure condition)
Constructs and returns a new selection view that is a matrix holding all slices matching the given condition. Applies the condition to each slice and takes only those where condition.apply(viewSlice(i)) yields true. To match rows or columns, use a dice view.

Example:

// extract and view all slices which have an aggregate sum > 1000
matrix.viewSelection( 
   new DoubleMatrix2DProcedure() {
      public final boolean apply(DoubleMatrix2D m) { return m.zSum > 1000; }
   }
);
For further examples, see the package doc. The returned view is backed by this matrix, so changes in the returned view are reflected in this matrix, and vice-versa.

Parameters:
condition - The condition to be matched.
Returns:
the new view.

viewSelectionLike

protected abstract DoubleMatrix3D viewSelectionLike(int[] sliceOffsets,
                                                    int[] rowOffsets,
                                                    int[] columnOffsets)
Construct and returns a new selection view.

Parameters:
sliceOffsets - the offsets of the visible elements.
rowOffsets - the offsets of the visible elements.
columnOffsets - the offsets of the visible elements.
Returns:
a new view.

viewSlice

public DoubleMatrix2D viewSlice(int slice)
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.

Parameters:
slice - the index of the slice to fix.
Returns:
a new 2-dimensional slice view.
Throws:
java.lang.IndexOutOfBoundsException - if slice < 0 || slice >= slices().
See Also:
viewRow(int), viewColumn(int)

viewSliceFlip

public DoubleMatrix3D viewSliceFlip()
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.

Returns:
a new flip view.
See Also:
viewRowFlip(), viewColumnFlip()

viewSorted

public DoubleMatrix3D viewSorted(int row,
                                 int column)
Sorts the matrix slices into ascending order, according to the natural ordering of the matrix values in the given [row,column] position. This sort is guaranteed to be stable. For further information, see Sorting.sort(DoubleMatrix3D,int,int). For more advanced sorting functionality, see Sorting.

Returns:
a new sorted vector (matrix) view.
Throws:
java.lang.IndexOutOfBoundsException - if row < 0 || row >= rows() || column < 0 || column >= columns().

viewStrides

public 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. 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.

Parameters:
sliceStride - the slice step factor.
rowStride - the row step factor.
columnStride - the column step factor.
Returns:
a new view.
Throws:
java.lang.IndexOutOfBoundsException - if sliceStride<=0 || rowStride<=0 || columnStride<=0.

zAssign27Neighbors

public void zAssign27Neighbors(DoubleMatrix3D B,
                               Double27Function function)
27 neighbor stencil transformation. For efficient finite difference operations. Applies a function to a moving 3 x 3 x 3 window. Does nothing if rows() < 3 || columns() < 3 || slices() < 3.
B[k,i,j] = function.apply(
   A[k-1,i-1,j-1], A[k-1,i-1,j], A[k-1,i-1,j+1],
   A[k-1,i,  j-1], A[k-1,i,  j], A[k-1,i,  j+1],
   A[k-1,i+1,j-1], A[k-1,i+1,j], A[k-1,i+1,j+1],

   A[k  ,i-1,j-1], A[k  ,i-1,j], A[k  ,i-1,j+1],
   A[k  ,i,  j-1], A[k  ,i,  j], A[k  ,i,  j+1],
   A[k  ,i+1,j-1], A[k  ,i+1,j], A[k  ,i+1,j+1],

   A[k+1,i-1,j-1], A[k+1,i-1,j], A[k+1,i-1,j+1],
   A[k+1,i,  j-1], A[k+1,i,  j], A[k+1,i,  j+1],
   A[k+1,i+1,j-1], A[k+1,i+1,j], A[k+1,i+1,j+1]
   )

x x x -     - x x x     - - - - 
x o x -     - x o x     - - - - 
x x x -     - x x x ... - x x x 
- - - -     - - - -     - x o x 
- - - -     - - - -     - x x x 
Make sure that cells of this and B do not overlap. In case of overlapping views, behaviour is unspecified.

Example:

final double alpha = 0.25;
final double beta = 0.75;

cern.colt.function.Double27Function f = new cern.colt.function.Double27Function() {
   public final double apply(
      double a000, double a001, double a002,
      double a010, double a011, double a012,
      double a020, double a021, double a022,

      double a100, double a101, double a102,
      double a110, double a111, double a112,
      double a120, double a121, double a122,

      double a200, double a201, double a202,
      double a210, double a211, double a212,
      double a220, double a221, double a222) {
         return beta*a111 + alpha*(a000 + ... + a222);
      }
};
A.zAssign27Neighbors(B,f);

Parameters:
B - the matrix to hold the results.
function - the function to be applied to the 27 cells.
Throws:
java.lang.NullPointerException - if function==null.
java.lang.IllegalArgumentException - if rows() != B.rows() || columns() != B.columns() || slices() != B.slices() .

zSum

public double zSum()
Returns the sum of all cells; Sum( x[i,j,k] ).

Returns:
the sum.