Jampack

Class Pivot

java.lang.Object

Jampack.Pivot

public class Pivot
extends Object

Pivot applys a sequence of pivot operations to the rows of a matrix. The pivot sequence is contained in an integer array pvt[], which determines a permution as follows:

      for (k=0; k<pvt.length; k++)
         swap k and pvt[k];

Both k and pvt[k] represent zero-based references to the rows of the matrix. Pivot also has a method to apply the inverse permutation.

Comments: Column pivoting will be added later.

Version:

Pre-alpha

Author:

G. W. Stewart

Constructor Summary

Constructors

Constructor and Description
Pivot()

Method Summary

Methods

Modifier and Type	Method and Description
static Zmat	row(Zmat A, int[] pvt) Pivots the rows of a Zmat (altered) as specified by a pivot array.
static Zmat	rowi(Zmat A, int[] pvt) Pivots the rows of a Zmat (altered) as in the inverse order specified by a pivot array.

Methods inherited from class java.lang.Object

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

Constructor Detail

Pivot

public Pivot()

Method Detail

row

public static Zmat row(Zmat A,
       int[] pvt)
                throws JampackException

Pivots the rows of a Zmat (altered) as specified by a pivot array.

Parameters:

A - The Zmat (altered)

pvt - The pivot array

Returns:

The Zmat A with its rows permuted

Throws:

JampackException - Thrown for inconsistent dimensions.

rowi

public static Zmat rowi(Zmat A,
        int[] pvt)
                 throws JampackException

Pivots the rows of a Zmat (altered) as in the inverse order specified by a pivot array.

Parameters:

A - The Zmat (altered)

pvt - The pivot array

Returns:

The Zmat A with its rows permuted

Throws:

JampackException - Thrown for inconsitent dimensions.