Package ubic.gemma.core.datastructure.sparse

Class CompRowMatrixUtils

java.lang.Object

ubic.gemma.core.datastructure.sparse.CompRowMatrixUtils

public class CompRowMatrixUtils
extends Object

Utilities for CompRowMatrix.

Author:

poirigui

Constructor Summary

Constructors

Constructor	Description
CompRowMatrixUtils()

Method Summary

Modifier and Type	Method	Description
static no.uib.cipr.matrix.sparse.CompRowMatrix	newCompRowMatrix(int numRows, int numColumns, int[] rowptr, int[] colind, double[] data)	Create a compressed row matrix from its internal arrays using reflection.
static no.uib.cipr.matrix.sparse.CompRowMatrix	selectColumns(no.uib.cipr.matrix.sparse.CompRowMatrix matrix, int[] columns)	Select the specified columns from a compressed row matrix.
static no.uib.cipr.matrix.sparse.CompRowMatrix	selectRows(no.uib.cipr.matrix.sparse.CompRowMatrix matrix, int[] rows)	Select the specified rows from a compressed row matrix.

Methods inherited from class java.lang.Object

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

Constructor Details

CompRowMatrixUtils

public CompRowMatrixUtils()

Method Details

newCompRowMatrix

public static no.uib.cipr.matrix.sparse.CompRowMatrix newCompRowMatrix(int numRows,
 int numColumns,
 int[] rowptr,
 int[] colind,
 double[] data)

Create a compressed row matrix from its internal arrays using reflection.

This is much faster than using the public constructor, but no validation is performed, so you have to make sure that it is correct.

selectRows

public static no.uib.cipr.matrix.sparse.CompRowMatrix selectRows(no.uib.cipr.matrix.sparse.CompRowMatrix matrix,
 int[] rows)

Select the specified rows from a compressed row matrix.

selectColumns

public static no.uib.cipr.matrix.sparse.CompRowMatrix selectColumns(no.uib.cipr.matrix.sparse.CompRowMatrix matrix,
 int[] columns)

Select the specified columns from a compressed row matrix.

If the requested columns are sorted, the method will perform a more efficient binary search by narrowing down the range for locating columns. If in addition, the requested columns are unique, this method will be able to finish early when it reaches the end of the search range.