org.apache.sysml.runtime.compress

Class ReaderColumnSelectionSparse

java.lang.Object

org.apache.sysml.runtime.compress.ReaderColumnSelection

org.apache.sysml.runtime.compress.ReaderColumnSelectionSparse

public class ReaderColumnSelectionSparse
extends ReaderColumnSelection

Used to extract the values at certain indexes from each row in a sparse matrix Keeps returning all-zeros arrays until reaching the last possible index. The current compression algorithm treats the zero-value in a sparse matrix like any other value.

Field Summary

Fields inherited from class org.apache.sysml.runtime.compress.ReaderColumnSelection

_colIndexes, _lastRow, _numRows, _skipZeros

Constructor Summary

Constructors

Constructor and Description
ReaderColumnSelectionSparse(MatrixBlock data, int[] colIndexes, boolean skipZeros)

Method Summary

Modifier and Type	Method and Description
DblArray	nextRow() Gets the next row, null when no more rows.

Methods inherited from class org.apache.sysml.runtime.compress.ReaderColumnSelection

getCurrentRowIndex, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

ReaderColumnSelectionSparse

public ReaderColumnSelectionSparse(MatrixBlock data,
                                   int[] colIndexes,
                                   boolean skipZeros)

Method Detail

nextRow

public DblArray nextRow()

Description copied from class: ReaderColumnSelection

Gets the next row, null when no more rows.

Specified by:

nextRow in class ReaderColumnSelection

Returns:

next row