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.

Constructor Summary

Constructors

Constructor and Description
Pivot()

Method Summary

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

equals, 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.