org.apache.mahout.math
Class UpperTriangular

java.lang.Object
  extended by org.apache.mahout.math.AbstractMatrix
      extended by org.apache.mahout.math.UpperTriangular
All Implemented Interfaces:
Cloneable, Iterable<MatrixSlice>, Matrix, VectorIterable
Direct Known Subclasses:
DenseSymmetricMatrix

public class UpperTriangular
extends AbstractMatrix

Quick and dirty implementation of some Matrix methods over packed upper triangular matrix.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.mahout.math.AbstractMatrix
AbstractMatrix.TransposeViewVector
 
Field Summary
 
Fields inherited from class org.apache.mahout.math.AbstractMatrix
COL, columnLabelBindings, columns, ROW, rowLabelBindings, rows
 
Constructor Summary
UpperTriangular(double[] data, boolean shallow)
           
UpperTriangular(int n)
          represents n x n upper triangular matrix
UpperTriangular(UpperTriangular mx)
           
UpperTriangular(Vector data)
           
 
Method Summary
 Matrix assignColumn(int column, Vector other)
          Assign the other vector values to the column of the receiver
 Matrix assignNonZeroElementsInRow(int row, double[] other)
           
 Matrix assignRow(int row, Vector other)
          Assign the other vector values to the row of the receiver
 double[] getData()
           
 int[] getNumNondefaultElements()
          Return the number of values in the recipient
 double getQuick(int row, int column)
          Return the value at the given indexes, without checking bounds
 Matrix like()
          Return an empty matrix of the same underlying class as the receiver
 Matrix like(int rows, int columns)
          Returns an empty matrix of the same underlying class as the receiver and of the specified size.
 void setQuick(int row, int column, double value)
          Set the value at the given index, without checking bounds
 Matrix viewPart(int[] offset, int[] size)
          Return a view into part of a matrix.
 
Methods inherited from class org.apache.mahout.math.AbstractMatrix
aggregate, aggregateColumns, aggregateRows, asFormatString, assign, assign, assign, assign, assign, clone, columnSize, determinant, divide, get, get, getColumnLabelBindings, getRowLabelBindings, iterateAll, iterator, minus, numCols, numRows, numSlices, plus, plus, rowSize, set, set, set, set, set, set, setColumnLabelBindings, setRowLabelBindings, times, times, times, timesSquared, toString, transpose, viewColumn, viewDiagonal, viewPart, viewRow, zSum
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

UpperTriangular

public UpperTriangular(int n)
represents n x n upper triangular matrix

Parameters:
n -

UpperTriangular

public UpperTriangular(double[] data,
                       boolean shallow)

UpperTriangular

public UpperTriangular(Vector data)

UpperTriangular

public UpperTriangular(UpperTriangular mx)
Method Detail

assignColumn

public Matrix assignColumn(int column,
                           Vector other)
Description copied from interface: Matrix
Assign the other vector values to the column of the receiver

Parameters:
column - the int row to assign
other - a Vector
Returns:
the modified receiver

assignRow

public Matrix assignRow(int row,
                        Vector other)
Description copied from interface: Matrix
Assign the other vector values to the row of the receiver

Parameters:
row - the int row to assign
other - a Vector
Returns:
the modified receiver

assignNonZeroElementsInRow

public Matrix assignNonZeroElementsInRow(int row,
                                         double[] other)

getQuick

public double getQuick(int row,
                       int column)
Description copied from interface: Matrix
Return the value at the given indexes, without checking bounds

Parameters:
row - an int row index
column - an int column index
Returns:
the double at the index

like

public Matrix like()
Description copied from interface: Matrix
Return an empty matrix of the same underlying class as the receiver

Returns:
a Matrix

like

public Matrix like(int rows,
                   int columns)
Description copied from interface: Matrix
Returns an empty matrix of the same underlying class as the receiver and of the specified size.

Parameters:
rows - the int number of rows
columns - the int number of columns

setQuick

public void setQuick(int row,
                     int column,
                     double value)
Description copied from interface: Matrix
Set the value at the given index, without checking bounds

Parameters:
row - an int row index into the receiver
column - an int column index into the receiver
value - a double value to set

getNumNondefaultElements

public int[] getNumNondefaultElements()
Description copied from interface: Matrix
Return the number of values in the recipient

Specified by:
getNumNondefaultElements in interface Matrix
Overrides:
getNumNondefaultElements in class AbstractMatrix
Returns:
an int[2] containing [row, column] count

viewPart

public Matrix viewPart(int[] offset,
                       int[] size)
Description copied from interface: Matrix
Return a view into part of a matrix. Changes to the view will change the original matrix.

Specified by:
viewPart in interface Matrix
Overrides:
viewPart in class AbstractMatrix
Parameters:
offset - an int[2] offset into the receiver
size - the int[2] size of the desired result
Returns:
a matrix that shares storage with part of the original matrix.

getData

public double[] getData()


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