org.apache.mahout.h2obindings

Class H2OBlockMatrix

java.lang.Object

org.apache.mahout.math.AbstractMatrix

org.apache.mahout.h2obindings.H2OBlockMatrix

All Implemented Interfaces:

Cloneable, Iterable<MatrixSlice>, Matrix, VectorIterable

public class H2OBlockMatrix
extends AbstractMatrix

A Matrix implementation to represent a vertical Block of DRM. Creation of the matrix is an O(1) operation with negligible overhead, and will remain so as long as the matrix is only read from (no modifications). On the first modification, create a copy on write Matrix and all further operations happen on this cow matrix. The benefit is, mapBlock() closures which never modify the input matrix save on the copy overhead.

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

Constructors

Constructor and Description
H2OBlockMatrix(water.fvec.Chunk[] chks) Class constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Matrix	assignColumn(int col, Vector v)
Matrix	assignRow(int row, Vector v)
MatrixFlavor	getFlavor()
double	getQuick(int row, int col)
Matrix	like()
Matrix	like(int nrow, int ncol)
void	setQuick(int row, int col, double val)

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, getNumNondefaultElements, getRowLabelBindings, iterateAll, iterateNonEmpty, 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, viewPart, viewRow, zSum

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

H2OBlockMatrix

public H2OBlockMatrix(water.fvec.Chunk[] chks)

Class constructor.

Method Detail

setQuick

public void setQuick(int row,
            int col,
            double val)

like

public Matrix like(int nrow,
          int ncol)

like

public Matrix like()

getQuick

public double getQuick(int row,
              int col)

assignRow

public Matrix assignRow(int row,
               Vector v)

assignColumn

public Matrix assignColumn(int col,
                  Vector v)

getFlavor

public MatrixFlavor getFlavor()

Specified by:

getFlavor in interface Matrix

Overrides:

getFlavor in class AbstractMatrix