cern.colt.matrix.impl

Class DenseDoubleMatrix3D

java.lang.Object

cern.colt.PersistentObject

cern.colt.matrix.impl.AbstractMatrix

cern.colt.matrix.impl.AbstractMatrix3D

cern.colt.matrix.DoubleMatrix3D

cern.colt.matrix.impl.DenseDoubleMatrix3D

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class DenseDoubleMatrix3D
extends DoubleMatrix3D

Dense 3-d matrix holding double elements. First see the package summary and javadoc tree view to get the broad picture.

Implementation:

Internally holds one single contigous one-dimensional array, addressed in (in decreasing order of significance): slice major, row major, column major. Note that this implementation is not synchronized.

Memory requirements:

memory [bytes] = 8*slices()*rows()*columns(). Thus, a 100*100*100 matrix uses 8 MB.

Time complexity:

O(1) (i.e. constant time) for the basic operations get, getQuick, set, setQuick and size,

Applications demanding utmost speed can exploit knowledge about the internal addressing. Setting/getting values in a loop slice-by-slice, row-by-row, column-by-column is quicker than, for example, column-by-column, row-by-row, slice-by-slice. Thus

   for (int slice=0; slice < slices; slice++) {
          for (int row=0; row < rows; row++) {
             for (int column=0; column < columns; column++) {
                        matrix.setQuick(slice,row,column,someValue);
                 }                  
          }
   }

is quicker than

   for (int column=0; column < columns; column++) {
          for (int row=0; row < rows; row++) {
             for (int slice=0; slice < slices; slice++) {
                        matrix.setQuick(slice,row,column,someValue);
                 }
          }
   }

See Also:

Serialized Form

Field Summary

Fields inherited from class cern.colt.PersistentObject

serialVersionUID

Constructor Summary

Constructors

Constructor and Description
DenseDoubleMatrix3D(double[][][] values) Constructs a matrix with a copy of the given values.
DenseDoubleMatrix3D(int slices, int rows, int columns) Constructs a matrix with a given number of slices, rows and columns.

Method Summary

Modifier and Type	Method and Description
DoubleMatrix3D	assign(double[][][] values) Sets all cells to the state specified by values.
DoubleMatrix3D	assign(DoubleMatrix3D source) Replaces all cell values of the receiver with the values of another matrix.
double	getQuick(int slice, int row, int column) Returns the matrix cell value at coordinate [slice,row,column].
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.
void	setQuick(int slice, int row, int column, double value) Sets the matrix cell at coordinate [slice,row,column] to the specified value.
void	zAssign27Neighbors(DoubleMatrix3D B, Double27Function function) 27 neighbor stencil transformation.

Methods inherited from class cern.colt.matrix.DoubleMatrix3D

aggregate, aggregate, assign, assign, assign, cardinality, copy, equals, equals, get, getNonZeros, like, set, toArray, toString, viewColumn, viewColumnFlip, viewDice, viewPart, viewRow, viewRowFlip, viewSelection, viewSelection, viewSlice, viewSliceFlip, viewSorted, viewStrides, zSum

Methods inherited from class cern.colt.matrix.impl.AbstractMatrix3D

checkShape, checkShape, columns, rows, size, slices, toStringShort

Methods inherited from class cern.colt.matrix.impl.AbstractMatrix

ensureCapacity, 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

DenseDoubleMatrix3D

public DenseDoubleMatrix3D(double[][][] values)

Constructs a matrix with a copy of the given values. values is required to have the form values[slice][row][column] and have exactly the same number of rows in in every slice and exactly the same number of columns in in every row.

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 new matrix.

Throws:

java.lang.IllegalArgumentException - if for any 1 <= slice < values.length: values[slice].length != values[slice-1].length.

java.lang.IllegalArgumentException - if for any 1 <= row < values[0].length: values[slice][row].length != values[slice][row-1].length.

DenseDoubleMatrix3D

public DenseDoubleMatrix3D(int slices,
                           int rows,
                           int columns)

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

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.

Throws:

java.lang.IllegalArgumentException - if (double)slices*columns*rows > Integer.MAX_VALUE.

java.lang.IllegalArgumentException - if slices<0 || rows<0 || columns<0.

Method Detail

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.

Overrides:

assign in class DoubleMatrix3D

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(DoubleMatrix3D source)

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.

Overrides:

assign in class DoubleMatrix3D

Parameters:

source - the source matrix to copy from (may be identical to the receiver).

Returns:

this (for convenience only).

Throws:

java.lang.IllegalArgumentException - if slices() != source.slices() || rows() != source.rows() || columns() != source.columns()

getQuick

public 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().

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)

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)

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.

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);

Overrides:

zAssign27Neighbors in class DoubleMatrix3D

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() .